Mac Studio, M5 Ultra, 256GB vs Mac Studio, M5 Ultra, 512GB
Both hold Llama-4-Scout-17B-16E at BF16. Mac Studio, M5 Ultra, 256GB is the faster of the two, at an est. 17.6 tok/s against 17.6. We do not have a price for both, so we do not name a winner.
- Fit
- Fits
- Fits
- Headroom
- 27GB
- 283GB
- Est. speed
- 17.6 tok/s
- 17.6 tok/s
- Cheapest today
- $9,499 at Apple
- no price yet
- Per GB of memory
- $37
- —
- Memory
- 256GB unified memory
- 512GB unified memory
- Usable for a model
- 248GB
- 504GB
- Memory bandwidth
- 1.2TB/s
- 1.2TB/s
- Storage
- 1TB
- 1TB
- Lowest recorded
- $9,499 in 2d
- none yet
Fit, headroom and speed are computed from each vendor’s published bandwidth and the model’s own size at 8K context. Prices are the cheapest listing we could read on each seller’s page. The arithmetic is here.
Where they actually differ
- Qwen3-235B-A22BWon't fitTight
- DeepSeek-V3Won't fitWon't fit
- Llama-3.3-70BFitsFits
- gpt-oss-120bTightFits
- Mistral-Large-2411Won't fitFits
- Llama-4-Scout-17B-16EFitsFits
- Qwen3-32BFitsFits
- Gemma-3-27BFitsFits
- gpt-oss-20bFitsFits
- Llama-4-Maverick-17B-128EWon't fitWon't fit
- Llama-4-BehemothWon't fitWon't fit
Every model we track at BF16. The rows where the two boxes agree are dimmed, because they are not what you are choosing between.