32 GB · RTX 5090 32 GB

Z-Image Turbo, Krea 2 Turbo and FIBO 2 Dev (INT8 and NVFP4) on an RTX 5090

Four prompts at 1024×1024 on one RTX 5090 32 GB, timed from request to finished image for six model variants in INT8 and NVFP4. Same prompts and seed for every model, images shown as generated.

Model makersTongyi-MAI (Z-Image Turbo), Krea (Krea 2 Turbo), BRIA AI (FIBO 2 Dev)Website GitHub Hugging Face Hugging Face Hugging Face

ComfyUI repacks used for all official runs (INT8 ConvRot, NVFP4) and the ComfyUI engineComfy-OrgHugging Face Hugging Face Hugging Face GitHub

Unofficial NVFP4 quantization of FIBO 2 Dev (not a BRIA or Comfy-Org release)BennyDaBallHugging Face

ImageZ-Image Turbo, Krea 2 Turbo, FIBO 2 Devmeasured 29 Oct 2026not rankedAI-generated outputs

Not ranked. Measured on the devices shown here only. Simpler image protocol than the image test v2 of 20 Oct 2026 (4 prompts, one seed, no prompt upsampler comparison); measured on one device only, shown separately and not ranked.

32 GB

RTX 5090 32 GB · Z-Image Turbo INT8 · 1024×1024 · 8 steps

one RTX 5090 32 GB

Median time per image1.56 s12 images (4 prompts x 3 passes), median of 12; time = request to finished image incl. text encoder, VAE, save

Fastest image1.54 sfastest of the 12 timed images

Slowest image1.60 sslowest of the 12 timed images

Denoising loop, median1.24 s8 steps; derived from the server log progress bar, median of 12 images, rounded it/s

GPU memory in use, peak14948 MiBwhole GPU incl. text encoder and VAE, sampled every 100 ms; not the minimum needed

Weight file size6.20 GBz_image_turbo_int8_convrot.safetensors

32 GB

RTX 5090 32 GB · Z-Image Turbo NVFP4 · 1024×1024 · 8 steps

one RTX 5090 32 GB

Median time per image1.39 s12 images (4 prompts x 3 passes), median of 12; time = request to finished image incl. text encoder, VAE, save

Fastest image1.36 sfastest of the 12 timed images

Slowest image1.41 sslowest of the 12 timed images

Denoising loop, median1.04 s8 steps; derived from the server log progress bar, median of 12 images, rounded it/s

GPU memory in use, peak13382 MiBwhole GPU incl. text encoder and VAE, sampled every 100 ms; not the minimum needed

Weight file size4.51 GBz_image_turbo_nvfp4.safetensors

32 GB

RTX 5090 32 GB · Krea 2 Turbo INT8 · 1024×1024 · 8 steps

one RTX 5090 32 GB

Median time per image2.95 s12 images (4 prompts x 3 passes), median of 12; time = request to finished image incl. text encoder, VAE, save

Fastest image2.89 sfastest of the 12 timed images

Slowest image3.24 sslowest of the 12 timed images

Denoising loop, median2.68 s8 steps; derived from the server log progress bar, median of 12 images, rounded it/s

GPU memory in use, peak19428 MiBwhole GPU incl. text encoder and VAE, sampled every 100 ms; not the minimum needed

Weight file size13.49 GBkrea2_turbo_int8_convrot.safetensors

32 GB

RTX 5090 32 GB · Krea 2 Turbo NVFP4 · 1024×1024 · 8 steps

one RTX 5090 32 GB

Median time per image3.87 s12 images (4 prompts x 3 passes), median of 12; time = request to finished image incl. text encoder, VAE, save

Fastest image3.73 sfastest of the 12 timed images

Slowest image4.16 sslowest of the 12 timed images

Denoising loop, median3.60 s8 steps; derived from the server log progress bar, median of 12 images, rounded it/s

GPU memory in use, peak13958 MiBwhole GPU incl. text encoder and VAE, sampled every 100 ms; not the minimum needed

Weight file size7.67 GBkrea2_turbo_nvfp4.safetensors

32 GB

RTX 5090 32 GB · FIBO 2 Dev INT8 · 1024×1024 · 50 steps

one RTX 5090 32 GB

Median time per image19.37 s12 images (4 prompts x 3 passes), median of 12; time = request to finished image incl. text encoder, VAE, save

Fastest image19.28 sfastest of the 12 timed images

Slowest image19.42 sslowest of the 12 timed images

Denoising loop, median18.73 s50 steps; derived from the server log progress bar, median of 12 images, rounded it/s

GPU memory in use, peak17468 MiBwhole GPU incl. text encoder and VAE, sampled every 100 ms; not the minimum needed

Weight file size8.41 GBfibo2_dev_int8_convrot.safetensors

32 GB

RTX 5090 32 GB · FIBO 2 Dev NVFP4 · unofficial · 1024×1024 · 50 steps

one RTX 5090 32 GB

Median time per image17.86 s12 images (4 prompts x 3 passes), median of 12; time = request to finished image incl. text encoder, VAE, save

Fastest image17.80 sfastest of the 12 timed images

Slowest image17.95 sslowest of the 12 timed images

Denoising loop, median17.18 s50 steps; derived from the server log progress bar, median of 12 images, rounded it/s

GPU memory in use, peak16414 MiBwhole GPU incl. text encoder and VAE, sampled every 100 ms; not the minimum needed

Weight file size7.27 GBfibo2_dev_nvfp4.safetensors

Outputs

Real outputs

Fashion portrait of a woman at a rooftop bar at blue hour, generated by Z-Image Turbo INT8 — AI-generated Z-Image Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I1 (portrait) · 1.56 s Prompt: A photorealistic fashion portrait of a beautiful East Asian model in her early twenties, an adult woman, looking straight into the camera with a seductive, confident gaze and slightly parted lips. She wears an elegant off-shoulder black silk top, stylish and tasteful, and sits at a rooftop bar at blue hour with blurred city lights behind her. Warm key light on her face, a cool pink-blue neon rim light in her hair, sharp catchlights in both eyes, natural skin texture with fine pores and individual strands of hair. Shot on an 85mm f/1.4 lens, shallow depth of field, creamy bokeh, true-to-life color, looks like a real magazine photo. full size

Night beach scene with a fire breather, generated by Z-Image Turbo INT8 — AI-generated Z-Image Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I2 (fire breather) · 1.56 s Prompt: A cinematic night photograph of a fire breather on a dark, empty beach. A man in a black tank top blows a huge roaring plume of fire into the air. The flames light up his face, his skin, the wet sand, the foam of the waves and the smoke around him in bright orange, while the sea and the sky behind him stay deep blue-black. Sparks and glowing embers drift in the wind, the wet sand reflects the fire, a few onlookers stand as dark silhouettes at the edge of the light. Fast shutter freezes the texture of the flame, high dynamic range, sharp details, natural film grain. full size

Motorcycle jump off a collapsing highway overpass at night in rain, generated by Z-Image Turbo INT8 — AI-generated Z-Image Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I3 (action) · 1.58 s Prompt: A cinematic still from a big-budget action movie: a lone courier in a torn black jacket and white helmet launches a motorcycle off a collapsing neon-lit highway overpass at night in heavy rain, frozen at the peak of the jump over a burning gap. Chunks of concrete, sparks and glowing embers hang in the air around the bike, raindrops streak past in the light, the front wheel throws a spray of water. Two helicopters with blinding white searchlights cut through the rain behind, a futuristic city skyline glows in teal and magenta, a huge orange fireball lights the rider from below. Dramatic low-angle shot, anamorphic lens flare, strong rim light, deep teal and orange color grade, motion blur on the background, razor-sharp rider, ultra detailed, widescreen film still. full size

Bioluminescent alien rainforest at night, generated by Z-Image Turbo INT8 — AI-generated Z-Image Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I4 (alien forest) · 1.54 s Prompt: A breathtaking wide shot of a bioluminescent alien rainforest at night. Giant glowing trees with roots like cathedral arches, floating mountains with waterfalls in the distance, huge glowing mushrooms and ferns, vines that light up in neon cyan, violet and magenta, glowing seeds drifting through the air like tiny jellyfish, a large winged creature gliding past two moons. A small figure stands on a branch for scale. Deep blues and purples, volumetric mist, soft glow everywhere, ultra detailed, cinematic fantasy film still. full size

Fashion portrait of a woman at a rooftop bar at blue hour, generated by Z-Image Turbo NVFP4 — AI-generated Z-Image Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I1 (portrait) · 1.38 s Prompt: A photorealistic fashion portrait of a beautiful East Asian model in her early twenties, an adult woman, looking straight into the camera with a seductive, confident gaze and slightly parted lips. She wears an elegant off-shoulder black silk top, stylish and tasteful, and sits at a rooftop bar at blue hour with blurred city lights behind her. Warm key light on her face, a cool pink-blue neon rim light in her hair, sharp catchlights in both eyes, natural skin texture with fine pores and individual strands of hair. Shot on an 85mm f/1.4 lens, shallow depth of field, creamy bokeh, true-to-life color, looks like a real magazine photo. full size

Night beach scene with a fire breather, generated by Z-Image Turbo NVFP4 — AI-generated Z-Image Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I2 (fire breather) · 1.40 s Prompt: A cinematic night photograph of a fire breather on a dark, empty beach. A man in a black tank top blows a huge roaring plume of fire into the air. The flames light up his face, his skin, the wet sand, the foam of the waves and the smoke around him in bright orange, while the sea and the sky behind him stay deep blue-black. Sparks and glowing embers drift in the wind, the wet sand reflects the fire, a few onlookers stand as dark silhouettes at the edge of the light. Fast shutter freezes the texture of the flame, high dynamic range, sharp details, natural film grain. full size

Motorcycle jump off a collapsing highway overpass at night in rain, generated by Z-Image Turbo NVFP4 — AI-generated Z-Image Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I3 (action) · 1.40 s Prompt: A cinematic still from a big-budget action movie: a lone courier in a torn black jacket and white helmet launches a motorcycle off a collapsing neon-lit highway overpass at night in heavy rain, frozen at the peak of the jump over a burning gap. Chunks of concrete, sparks and glowing embers hang in the air around the bike, raindrops streak past in the light, the front wheel throws a spray of water. Two helicopters with blinding white searchlights cut through the rain behind, a futuristic city skyline glows in teal and magenta, a huge orange fireball lights the rider from below. Dramatic low-angle shot, anamorphic lens flare, strong rim light, deep teal and orange color grade, motion blur on the background, razor-sharp rider, ultra detailed, widescreen film still. full size

Bioluminescent alien rainforest at night, generated by Z-Image Turbo NVFP4 — AI-generated Z-Image Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I4 (alien forest) · 1.36 s Prompt: A breathtaking wide shot of a bioluminescent alien rainforest at night. Giant glowing trees with roots like cathedral arches, floating mountains with waterfalls in the distance, huge glowing mushrooms and ferns, vines that light up in neon cyan, violet and magenta, glowing seeds drifting through the air like tiny jellyfish, a large winged creature gliding past two moons. A small figure stands on a branch for scale. Deep blues and purples, volumetric mist, soft glow everywhere, ultra detailed, cinematic fantasy film still. full size

Fashion portrait of a woman at a rooftop bar at blue hour, generated by Krea 2 Turbo INT8 — AI-generated Krea 2 Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I1 (portrait) · 2.94 s Prompt: A photorealistic fashion portrait of a beautiful East Asian model in her early twenties, an adult woman, looking straight into the camera with a seductive, confident gaze and slightly parted lips. She wears an elegant off-shoulder black silk top, stylish and tasteful, and sits at a rooftop bar at blue hour with blurred city lights behind her. Warm key light on her face, a cool pink-blue neon rim light in her hair, sharp catchlights in both eyes, natural skin texture with fine pores and individual strands of hair. Shot on an 85mm f/1.4 lens, shallow depth of field, creamy bokeh, true-to-life color, looks like a real magazine photo. full size

Night beach scene with a fire breather, generated by Krea 2 Turbo INT8 — AI-generated Krea 2 Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I2 (fire breather) · 2.93 s Prompt: A cinematic night photograph of a fire breather on a dark, empty beach. A man in a black tank top blows a huge roaring plume of fire into the air. The flames light up his face, his skin, the wet sand, the foam of the waves and the smoke around him in bright orange, while the sea and the sky behind him stay deep blue-black. Sparks and glowing embers drift in the wind, the wet sand reflects the fire, a few onlookers stand as dark silhouettes at the edge of the light. Fast shutter freezes the texture of the flame, high dynamic range, sharp details, natural film grain. full size

Motorcycle jump off a collapsing highway overpass at night in rain, generated by Krea 2 Turbo INT8 — AI-generated Krea 2 Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I3 (action) · 3.21 s Prompt: A cinematic still from a big-budget action movie: a lone courier in a torn black jacket and white helmet launches a motorcycle off a collapsing neon-lit highway overpass at night in heavy rain, frozen at the peak of the jump over a burning gap. Chunks of concrete, sparks and glowing embers hang in the air around the bike, raindrops streak past in the light, the front wheel throws a spray of water. Two helicopters with blinding white searchlights cut through the rain behind, a futuristic city skyline glows in teal and magenta, a huge orange fireball lights the rider from below. Dramatic low-angle shot, anamorphic lens flare, strong rim light, deep teal and orange color grade, motion blur on the background, razor-sharp rider, ultra detailed, widescreen film still. full size

Bioluminescent alien rainforest at night, generated by Krea 2 Turbo INT8 — AI-generated Krea 2 Turbo INT8, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I4 (alien forest) · 2.89 s Prompt: A breathtaking wide shot of a bioluminescent alien rainforest at night. Giant glowing trees with roots like cathedral arches, floating mountains with waterfalls in the distance, huge glowing mushrooms and ferns, vines that light up in neon cyan, violet and magenta, glowing seeds drifting through the air like tiny jellyfish, a large winged creature gliding past two moons. A small figure stands on a branch for scale. Deep blues and purples, volumetric mist, soft glow everywhere, ultra detailed, cinematic fantasy film still. full size

Fashion portrait of a woman at a rooftop bar at blue hour, generated by Krea 2 Turbo NVFP4 — AI-generated Krea 2 Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I1 (portrait) · 3.88 s Prompt: A photorealistic fashion portrait of a beautiful East Asian model in her early twenties, an adult woman, looking straight into the camera with a seductive, confident gaze and slightly parted lips. She wears an elegant off-shoulder black silk top, stylish and tasteful, and sits at a rooftop bar at blue hour with blurred city lights behind her. Warm key light on her face, a cool pink-blue neon rim light in her hair, sharp catchlights in both eyes, natural skin texture with fine pores and individual strands of hair. Shot on an 85mm f/1.4 lens, shallow depth of field, creamy bokeh, true-to-life color, looks like a real magazine photo. full size

Night beach scene with a fire breather, generated by Krea 2 Turbo NVFP4 — AI-generated Krea 2 Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I2 (fire breather) · 3.87 s Prompt: A cinematic night photograph of a fire breather on a dark, empty beach. A man in a black tank top blows a huge roaring plume of fire into the air. The flames light up his face, his skin, the wet sand, the foam of the waves and the smoke around him in bright orange, while the sea and the sky behind him stay deep blue-black. Sparks and glowing embers drift in the wind, the wet sand reflects the fire, a few onlookers stand as dark silhouettes at the edge of the light. Fast shutter freezes the texture of the flame, high dynamic range, sharp details, natural film grain. full size

Motorcycle jump off a collapsing highway overpass at night in rain, generated by Krea 2 Turbo NVFP4 — AI-generated Krea 2 Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I3 (action) · 4.14 s Prompt: A cinematic still from a big-budget action movie: a lone courier in a torn black jacket and white helmet launches a motorcycle off a collapsing neon-lit highway overpass at night in heavy rain, frozen at the peak of the jump over a burning gap. Chunks of concrete, sparks and glowing embers hang in the air around the bike, raindrops streak past in the light, the front wheel throws a spray of water. Two helicopters with blinding white searchlights cut through the rain behind, a futuristic city skyline glows in teal and magenta, a huge orange fireball lights the rider from below. Dramatic low-angle shot, anamorphic lens flare, strong rim light, deep teal and orange color grade, motion blur on the background, razor-sharp rider, ultra detailed, widescreen film still. full size

Bioluminescent alien rainforest at night, generated by Krea 2 Turbo NVFP4 — AI-generated Krea 2 Turbo NVFP4, RTX 5090, seed 42, 8 steps, 1024×1024, prompt I4 (alien forest) · 3.74 s Prompt: A breathtaking wide shot of a bioluminescent alien rainforest at night. Giant glowing trees with roots like cathedral arches, floating mountains with waterfalls in the distance, huge glowing mushrooms and ferns, vines that light up in neon cyan, violet and magenta, glowing seeds drifting through the air like tiny jellyfish, a large winged creature gliding past two moons. A small figure stands on a branch for scale. Deep blues and purples, volumetric mist, soft glow everywhere, ultra detailed, cinematic fantasy film still. full size

Fashion portrait of a woman at a rooftop bar at blue hour, generated by FIBO 2 Dev INT8 — AI-generated FIBO 2 Dev INT8, RTX 5090, seed 42, 50 steps, 1024×1024, prompt I1 (portrait) · 19.28 s Prompt: A photorealistic fashion portrait of a beautiful East Asian model in her early twenties, an adult woman, looking straight into the camera with a seductive, confident gaze and slightly parted lips. She wears an elegant off-shoulder black silk top, stylish and tasteful, and sits at a rooftop bar at blue hour with blurred city lights behind her. Warm key light on her face, a cool pink-blue neon rim light in her hair, sharp catchlights in both eyes, natural skin texture with fine pores and individual strands of hair. Shot on an 85mm f/1.4 lens, shallow depth of field, creamy bokeh, true-to-life color, looks like a real magazine photo. full size

Night beach scene with a fire breather, generated by FIBO 2 Dev INT8 — AI-generated FIBO 2 Dev INT8, RTX 5090, seed 42, 50 steps, 1024×1024, prompt I2 (fire breather) · 19.34 s Prompt: A cinematic night photograph of a fire breather on a dark, empty beach. A man in a black tank top blows a huge roaring plume of fire into the air. The flames light up his face, his skin, the wet sand, the foam of the waves and the smoke around him in bright orange, while the sea and the sky behind him stay deep blue-black. Sparks and glowing embers drift in the wind, the wet sand reflects the fire, a few onlookers stand as dark silhouettes at the edge of the light. Fast shutter freezes the texture of the flame, high dynamic range, sharp details, natural film grain. full size

Motorcycle jump off a collapsing highway overpass at night in rain, generated by FIBO 2 Dev INT8 — AI-generated FIBO 2 Dev INT8, RTX 5090, seed 42, 50 steps, 1024×1024, prompt I3 (action) · 19.38 s Prompt: A cinematic still from a big-budget action movie: a lone courier in a torn black jacket and white helmet launches a motorcycle off a collapsing neon-lit highway overpass at night in heavy rain, frozen at the peak of the jump over a burning gap. Chunks of concrete, sparks and glowing embers hang in the air around the bike, raindrops streak past in the light, the front wheel throws a spray of water. Two helicopters with blinding white searchlights cut through the rain behind, a futuristic city skyline glows in teal and magenta, a huge orange fireball lights the rider from below. Dramatic low-angle shot, anamorphic lens flare, strong rim light, deep teal and orange color grade, motion blur on the background, razor-sharp rider, ultra detailed, widescreen film still. full size

Bioluminescent alien rainforest at night, generated by FIBO 2 Dev INT8 — AI-generated FIBO 2 Dev INT8, RTX 5090, seed 42, 50 steps, 1024×1024, prompt I4 (alien forest) · 19.33 s Prompt: A breathtaking wide shot of a bioluminescent alien rainforest at night. Giant glowing trees with roots like cathedral arches, floating mountains with waterfalls in the distance, huge glowing mushrooms and ferns, vines that light up in neon cyan, violet and magenta, glowing seeds drifting through the air like tiny jellyfish, a large winged creature gliding past two moons. A small figure stands on a branch for scale. Deep blues and purples, volumetric mist, soft glow everywhere, ultra detailed, cinematic fantasy film still. full size

Fashion portrait of a woman at a rooftop bar at blue hour, generated by FIBO 2 Dev NVFP4 (unofficial quantization) — AI-generated FIBO 2 Dev NVFP4 (unofficial quantization), RTX 5090, seed 42, 50 steps, 1024×1024, prompt I1 (portrait) · 17.80 s Prompt: A photorealistic fashion portrait of a beautiful East Asian model in her early twenties, an adult woman, looking straight into the camera with a seductive, confident gaze and slightly parted lips. She wears an elegant off-shoulder black silk top, stylish and tasteful, and sits at a rooftop bar at blue hour with blurred city lights behind her. Warm key light on her face, a cool pink-blue neon rim light in her hair, sharp catchlights in both eyes, natural skin texture with fine pores and individual strands of hair. Shot on an 85mm f/1.4 lens, shallow depth of field, creamy bokeh, true-to-life color, looks like a real magazine photo. full size

Night beach scene with a fire breather, generated by FIBO 2 Dev NVFP4 (unofficial quantization) — AI-generated FIBO 2 Dev NVFP4 (unofficial quantization), RTX 5090, seed 42, 50 steps, 1024×1024, prompt I2 (fire breather) · 17.85 s Prompt: A cinematic night photograph of a fire breather on a dark, empty beach. A man in a black tank top blows a huge roaring plume of fire into the air. The flames light up his face, his skin, the wet sand, the foam of the waves and the smoke around him in bright orange, while the sea and the sky behind him stay deep blue-black. Sparks and glowing embers drift in the wind, the wet sand reflects the fire, a few onlookers stand as dark silhouettes at the edge of the light. Fast shutter freezes the texture of the flame, high dynamic range, sharp details, natural film grain. full size

Motorcycle jump off a collapsing highway overpass at night in rain, generated by FIBO 2 Dev NVFP4 (unofficial quantization) — AI-generated FIBO 2 Dev NVFP4 (unofficial quantization), RTX 5090, seed 42, 50 steps, 1024×1024, prompt I3 (action) · 17.95 s Prompt: A cinematic still from a big-budget action movie: a lone courier in a torn black jacket and white helmet launches a motorcycle off a collapsing neon-lit highway overpass at night in heavy rain, frozen at the peak of the jump over a burning gap. Chunks of concrete, sparks and glowing embers hang in the air around the bike, raindrops streak past in the light, the front wheel throws a spray of water. Two helicopters with blinding white searchlights cut through the rain behind, a futuristic city skyline glows in teal and magenta, a huge orange fireball lights the rider from below. Dramatic low-angle shot, anamorphic lens flare, strong rim light, deep teal and orange color grade, motion blur on the background, razor-sharp rider, ultra detailed, widescreen film still. full size

Bioluminescent alien rainforest at night, generated by FIBO 2 Dev NVFP4 (unofficial quantization) — AI-generated FIBO 2 Dev NVFP4 (unofficial quantization), RTX 5090, seed 42, 50 steps, 1024×1024, prompt I4 (alien forest) · 17.88 s Prompt: A breathtaking wide shot of a bioluminescent alien rainforest at night. Giant glowing trees with roots like cathedral arches, floating mountains with waterfalls in the distance, huge glowing mushrooms and ferns, vines that light up in neon cyan, violet and magenta, glowing seeds drifting through the air like tiny jellyfish, a large winged creature gliding past two moons. A small figure stands on a branch for scale. Deep blues and purples, volumetric mist, soft glow everywhere, ultra detailed, cinematic fantasy film still. full size

Table

Median time per image in seconds by prompt, same prompts and seed 42, one RTX 5090. Median of 3 passes per prompt, last column the median of all 12 images. Not ranked.

Model and precision	Steps	I1 portrait	I2 fire breather	I3 action	I4 alien forest	Median of 12
Z-Image Turbo INT8 (ConvRot)	8	1.56	1.56	1.58	1.56	1.56
Z-Image Turbo NVFP4	8	1.38	1.40	1.40	1.36	1.39
Krea 2 Turbo INT8 (ConvRot)	8	2.95	2.95	3.23	2.90	2.95
Krea 2 Turbo NVFP4	8	3.88	3.87	4.14	3.74	3.87
FIBO 2 Dev INT8 (ConvRot)	50	19.31	19.37	19.40	19.37	19.37
FIBO 2 Dev NVFP4 (unofficial)	50	17.82	17.85	17.90	17.86	17.86

Raw file

Setup

How it was run

Device: one RTX 5090 32 GB, nothing else running on the GPU. Measured on this device only, not ranked.
Engine: stock ComfyUI v0.43.0 (commit 426f5eea52a7ece1dd599fff4cb6cd1f352ddd24), no custom nodes, PyTorch 2.14.0 dev (CUDA 13.0), comfy-kitchen 0.2.40.
Protocol: grid of 4 house prompts (portrait, fire breather, action scene, alien forest), seed 42, 1024×1024, plain-text prompts, no prompt expander. This is a simpler protocol than the image test v2 of 20 Oct 2026 (see notes).
Per variant: 3 passes with a fresh server each, one uncounted warm-up image per server start, then 4 timed images. 12 timed images per variant.
Time per image: request sent until the finished image is in the history. It includes text encoder, sampler, VAE and saving. Median of 12.
Z-Image Turbo: 8 steps, CFG 1, res_multistep / simple, shift 3. Weights INT8 ConvRot and NVFP4 (Comfy-Org repack), text encoder Qwen3 4B FP8 mixed, VAE ae.
Krea 2 Turbo: 8 steps, CFG 1, euler / simple. Weights INT8 ConvRot and NVFP4 (Comfy-Org repack), text encoder Qwen3-VL 4B FP8 scaled, Qwen-Image VAE. Prompt refine switch off, no LoRA.
FIBO 2 Dev: 50 steps, CFG 5, euler / simple, Bria negative prompt from the model card. Weights INT8 ConvRot (Comfy-Org repack) and an unofficial NVFP4 build. Text encoder Qwen3-VL 4B BF16, FLUX.2 VAE.
Precision: INT8 = 8-bit integer weights, NVFP4 = 4-bit floating point weights. FIBO 2 Dev has no official NVFP4 release; the NVFP4 cell is a third-party quantization, shown separately.

Notes

What to keep in mind

Measured on this device only, not ranked. The order on this page follows the models, not the results.

Protocol: this grid uses 4 prompts with one seed (42) and one image per prompt and variant. Passes 2 and 3 only repeat the timing with the same seed; the images are identical across passes (same sha256). There is no prompt upsampler on/off comparison and no seed spread, so it is not the image test v2 protocol.

Step counts differ by design: Z-Image Turbo and Krea 2 Turbo are distilled 8-step models, FIBO 2 Dev runs its full base setting of 50 steps with CFG 5. The times are not a like-for-like speed comparison between models.

FIBO 2 Dev was run with plain-text prompts. The model card recommends structured VGL JSON prompts, which the bria-vgl package creates with a paid Gemini API. We left that out, so FIBO images here may look different from the maker's showcase.

FIBO 2 Dev NVFP4 is an unofficial third-party quantization by BennyDaBall, not a release of BRIA AI or Comfy-Org. There is no official FIBO 2 Dev NVFP4.

The third-party author lists 16.86 s (INT8) and 15.68 s (NVFP4) per 1024×1024 image on an RTX 5090. We measured 19.37 s and 17.86 s. The methods differ: the author takes ComfyUI's own execution time, median of 4 to 6 warm runs with a new seed per run; we take wall time from request to saved image with the same seed.

Krea 2 Turbo NVFP4 is slower than Krea 2 Turbo INT8 in this setup (3.87 s against 2.95 s). Z-Image Turbo and FIBO NVFP4 are faster than their INT8 files. We did not investigate the Krea result.

Krea 2 Turbo ran at 1024×1024 like the other models. The model card's CLI example uses 2048×2048, and its --mu 1.15 option has no counterpart in the ComfyUI workflow, so it was not set.

The INT8 ConvRot and NVFP4 files are Comfy-Org repacks. Their model card says INT8 outputs differ slightly from the original weights.

GPU memory is the whole GPU while the run was active, including text encoder and VAE. It is not the minimum memory the model needs.

The denoising loop time is derived from the progress bar in the server logs (steps divided by iterations per second, rounded), so it carries a small rounding error. The remainder of each time is text encoder, VAE decode and saving.

No failures: all 72 images (6 variants x 4 prompts x 3 passes) finished. Image quality is not scored; the images are shown as generated, without retouching.

Not measured here: FIBO 2 Dev BF16, 16 GB cards, other devices, other resolutions.

License info: Z-Image Turbo Apache-2.0, Krea 2 Turbo under the Krea 2 Community License (operators must apply content filters), FIBO 2 Dev CC BY-NC 4.0 (non-commercial).

Exact command · All timings (72 images) · Median per prompt · Summary per variant · Denoising loop split · Server logs · Workflows · Prompts · Weights and checksums · Model revisions · Third-party author's numbers · All raw files