readygpu

Mac Studio M3 Ultra 256GB vs NVIDIA RTX PRO 5000 Blackwell 48GB

For running models locally, priced in the UK. At 8k context the first runs 84 models fully in memory, the second 68.

In short

The Mac Studio M3 Ultra 256GB has more memory for models: 256 GB against 48 GB. At 8k context the Mac Studio M3 Ultra 256GB runs 84 of the models we track fully in memory and the NVIDIA RTX PRO 5000 Blackwell 48GB 68; only the Mac Studio M3 Ultra 256GB holds DeepSeek V4 Flash. On the models both run fully in memory, the NVIDIA RTX PRO 5000 Blackwell 48GB is about 1.6× as fast as the Mac Studio M3 Ultra 256GB (estimated, median across models). In the UK the Mac Studio M3 Ultra 256GB costs £8,449 at eBay (used) and the NVIDIA RTX PRO 5000 Blackwell 48GB £8,587 at eBay: the Mac Studio M3 Ultra 256GB is £138 cheaper.

Updated . Speeds are estimates; how they are worked out.

Mac Studio M3 Ultra 256GB

£8,299

eBay

Add to build
NVIDIA RTX PRO 5000 Blackwell 48GB

£8,587

eBay

Add to build

Specifications

SpecMac Studio M3 Ultra 256GBNVIDIA RTX PRO 5000 Blackwell 48GB
ChipApple M3 Ultra (80-core GPU)–
Memory bus1024-bit384-bit
Memory bandwidth819 GB/s1,344 GB/s
FP16 compute28 TFLOPS73.69 TFLOPS
SoftwareMetalCUDA
Unified memory256 GB–
GPU can use by default192 GB–
GPU can use, tuned248 GB–
Operating systemmacos–
ProcessorM3 Ultra 32-core–
Storage2000 GB–
GPU–RTX PRO 5000 Blackwell 48GB
Memory–48 GB GDDR7
Board power–300 W
PCIe generation–Gen 5
PCIe lanes–x16

What each runs

Estimated decode speed with the most precise quant that fits each one est.

ModelMac Studio M3 Ultra 256GBNVIDIA RTX PRO 5000 Blackwell 48GB
DeepSeek V4 Flash27tok/sMXFP4won't run
GLM 5.3 Flash20tok/sUD-Q4_K_XLwon't run
Qwen 3.8 Flash Next5tok/sQ8_0won't run
MiniMax M2.728tok/sQ6_Koffload
Qwen 3.8 27B18tok/sQ8_028tok/sQ8_0
Qwen 3.5 122B-A10B30tok/sQ8_0135tok/sUD-Q2_K_XL
Qwen 3.6 27B18tok/sQ8_029tok/sQ8_0
gpt-oss 120B93tok/sMXFP4offload
Qwen3 Coder Next73tok/sQ8_0190tok/sQ4_K_M
Nemotron 3 Super 120B-A12B25tok/sQ8_0offload
Gemma 4 31B16tok/sQ8_024tok/sQ8_0
Mistral Small 4 119B42tok/sQ8_0195tok/sUD-Q2_K_XL
Qwen 3.6 35B-A3B97tok/sQ8_0151tok/sQ8_0
Qwen 3.5 27B18tok/sQ8_029tok/sQ8_0
Gemma 4 26B-A4B70tok/sQ8_0110tok/sQ8_0
GLM 4.5 Air20tok/sQ8_069tok/sQ2_K
Qwen 3.5 35B-A3B97tok/sQ8_0151tok/sQ8_0
Qwen3 Next 80B-A3B94tok/sQ8_0242tok/sQ4_K_M
GLM 4.7 Flash56tok/sQ8_087tok/sQ8_0
Devstral Small 2 24B20tok/sQ8_032tok/sQ8_0
Nemotron 3.5 Lightning 30B-A3B93tok/sUD-Q6_K_XL146tok/sUD-Q6_K_XL
gpt-oss 20B121tok/sMXFP4190tok/sMXFP4
Kimi Linear 48B-A3B97tok/sQ8_0194tok/sQ6_K
Qwen3 Coder 30B-A3B80tok/sQ8_0125tok/sQ8_0
Qwen3 32B14tok/sQ8_023tok/sQ8_0
Gemma 4 12B41tok/sQ8_063tok/sQ8_0
Qwen 3.5 9B54tok/sQ8_085tok/sQ8_0
Mistral Small 3.2 24B20tok/sQ8_032tok/sQ8_0
Gemma 3 27B18tok/sQ8_028tok/sQ8_0
DeepSeek R1 Distill Qwen 32B14tok/sQ8_023tok/sQ8_0
Llama 3.3 70B7tok/sQ8_018tok/sQ4_K_M
Ministral 3 14B34tok/sQ8_053tok/sQ8_0
Qwen3 14B31tok/sQ8_049tok/sQ8_0
DeepSeek R1 0528 Qwen3 8B54tok/sQ8_084tok/sQ8_0
Qwen3 8B54tok/sQ8_084tok/sQ8_0
Phi-4 14B31tok/sQ8_048tok/sQ8_0
Qwen 3.5 4B111tok/sQ8_0174tok/sQ8_0
Ministral 3 8B52tok/sQ8_082tok/sQ8_0
Granite 4.2 8B50tok/sQ8_078tok/sQ8_0
Gemma 4 E4B63tok/sQ8_098tok/sQ8_0
LFM2.5 8B-A1B218tok/sQ8_0341tok/sQ8_0
Llama 3.1 8B69tok/sQ6_K109tok/sQ6_K
Qwen2.5 0.5B843tok/sQ8_01319tok/sQ8_0
Qwen3.5 0.8B572tok/sQ8_0895tok/sQ8_0
Qwen3.5 2B342tok/sQ5_K_M536tok/sQ5_K_M
DeepSeek R1 Distill Qwen 1.5B250tok/sQ8_0391tok/sQ8_0
MiniCPM5 2B176tok/sQ8_0275tok/sQ8_0
LFM2.5 2.6B158tok/sQ8_0247tok/sQ8_0
LFM2.5 VL 3B158tok/sQ8_0247tok/sQ8_0
Spark X2.5 4B157tok/smlx-4bit245tok/smlx-4bit
granite vision 4.1 4b124tok/sQ8_0194tok/sQ8_0
Ministral 3 3B Instruct 2512118tok/sQ8_0184tok/sQ8_0
granite 4.2 3b117tok/sQ8_0183tok/sQ8_0
LFM2.5 24B A2B114tok/sQ8_0179tok/sQ8_0
Mellum2.1 12B A2.5B Thinking113tok/sQ8_0177tok/sQ8_0
FrogNano 4B 2609108tok/sQ8_0169tok/sQ8_0
Kimi VL A3B Thinking 250695tok/sQ8_0149tok/sQ8_0
Kimi VL A3B91tok/smlx-8bit142tok/smlx-8bit
DeepSeek R1 Distill Qwen 7B62tok/sQ8_097tok/sQ8_0
GLM 4 9B 041462tok/smlx-5bit97tok/smlx-5bit
DeepSeek R1 Distill Llama 8B55tok/sQ8_087tok/sQ8_0
Ministral 3 8B Reasoning 251252tok/sQ8_082tok/sQ8_0
GLM 4.6V Flash52tok/sQ8_081tok/sQ8_0
GLM 4.1V 9B Thinking44tok/smlx-8bit69tok/smlx-8bit
Ministral 3 14B Reasoning 251234tok/sQ8_053tok/sQ8_0
DeepSeek R1 Distill Qwen 14B31tok/sQ8_048tok/sQ8_0
MiniMax M229tok/sQ6_Kwon't run
MiniMax M2.129tok/sQ6_Kwon't run
MiniMax M2.529tok/sQ6_Kwon't run
Qwen3.8 27B OBLITERATED25tok/smlx-4bit39tok/smlx-4bit
Devstral Small 250720tok/sQ8_032tok/sQ8_0
Magistral Small 250620tok/sQ8_032tok/sQ8_0
Magistral Small 250720tok/sQ8_032tok/sQ8_0
Magistral Small 250920tok/sQ8_032tok/sQ8_0
GLM 4.5V19tok/sQ8_0offload
GLM 4.6V19tok/sQ8_0offload
DeepSeek V4 Flash 073118tok/sMXFP4won't run
DeepSeek V4 Flash Vision Exp17tok/sMXFP4won't run
Muse Glimmer 30B16tok/sQ8_026tok/sQ8_0
granite 4.2 30b16tok/sQ8_025tok/sQ8_0
DeepSeek R1 Distill Llama 70B7tok/sQ8_018tok/sQ4_K_M
Kimi Dev 72B7tok/sQ8_0offload
Devstral 2 123B Instruct 25124tok/sQ8_0offload
Mistral Medium 3.5 128B4tok/sQ8_0offload
DeepSeek R1won't runwon't run
DeepSeek R1 0528won't runwon't run
DeepSeek R1 Zerowon't runwon't run
DeepSeek V3won't runwon't run
DeepSeek V3 0324won't runwon't run
DeepSeek V3.1won't runwon't run
DeepSeek V3.1 Terminuswon't runwon't run
DeepSeek V3.2won't runwon't run
GLM 4.5won't runwon't run
GLM 4.6won't runwon't run
GLM 4.7won't runwon't run
GLM 5won't runwon't run
GLM 5.1won't runwon't run
GLM 5.2won't runwon't run
GLM 5.3won't runwon't run
Kimi K2won't runwon't run
Kimi K2 Instruct 0905won't runwon't run
Kimi K2 Thinkingwon't runwon't run
Kimi K2.5won't runwon't run
MiniMax M3won't runwon't run

Questions

Which is better for local AI, the Mac Studio M3 Ultra 256GB or the NVIDIA RTX PRO 5000 Blackwell 48GB?
Choose the Mac Studio M3 Ultra 256GB to run bigger models. Choose the NVIDIA RTX PRO 5000 Blackwell 48GB for speed. Choose the Mac Studio M3 Ultra 256GB to spend less.
Which can run bigger models, the Mac Studio M3 Ultra 256GB or the NVIDIA RTX PRO 5000 Blackwell 48GB?
At 8k context the Mac Studio M3 Ultra 256GB runs 84 of the models we track fully in memory and the NVIDIA RTX PRO 5000 Blackwell 48GB 68; only the Mac Studio M3 Ultra 256GB holds DeepSeek V4 Flash.
Which is faster for local AI, the Mac Studio M3 Ultra 256GB or the NVIDIA RTX PRO 5000 Blackwell 48GB?
On the models both run fully in memory, the NVIDIA RTX PRO 5000 Blackwell 48GB is about 1.6× as fast as the Mac Studio M3 Ultra 256GB (estimated, median across models).
What is the price difference between the Mac Studio M3 Ultra 256GB and the NVIDIA RTX PRO 5000 Blackwell 48GB?
In the UK the Mac Studio M3 Ultra 256GB costs £8,449 at eBay (used) and the NVIDIA RTX PRO 5000 Blackwell 48GB £8,587 at eBay: the Mac Studio M3 Ultra 256GB is £138 cheaper.

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