Can I Run Devstral on Apple M5 Max?
Written by Jakub Rusinowski · Last updated September 29, 2026
Yes, comfortably — Devstral-2 123B at Q4_K_M needs 77.9 GB at 8K context (74.3 GB weights + 3.6 GB KV cache/overhead), leaving ~18.1 GB of the Apple M5 Max's 96 GB usable memory, at ~4 tok/s (est.), with room for up to 32K context.
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Apple M5 Max Specs
| VRAM | 128 GB unified memory |
| Memory Bandwidth | 614 GB/s |
Devstral-2 123B on the Apple M5 Max: VRAM by quantization
| Quant | VRAM needed | Fits 128 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 249.7 GB | ✗ No | — | — |
| Q8_0 | 134.4 GB | ✗ No | — | — |
| Q6_K | 104.5 GB | ✗ No | — | — |
| Q5_K_M | 90.9 GB | ✓ Yes | 16K | — |
| Q4_K_M | 77.9 GB | ✓ Yes | 32K | — |
| Q3_K_M | 56.1 GB | ✓ Yes | 64K | — |
| Q2_K | 44.1 GB | ✓ Yes | 128K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 128 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M5 Max: 8K 77.9 GB · 32K 86.6 GB · 128K 121.2 GB ✗. Past 128K it no longer fits 128 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Devstral on 16 GB of system RAM, CPU only: runs, but it is tight.
Devstral Sizes That Fit the Apple M5 Max (at 8K context)
| Devstral-2 123B | Q4_K_M · 77.9 GB at 8K context · ~4 tok/s (est.) |
| Devstral Small 2505 24B | Q4_K_M · 16.6 GB at 8K context · ~21 tok/s (est.) |
| Devstral Small 2 24B | Q4_K_M · 16.6 GB at 8K context · ~21 tok/s (est.) |
| Devstral 2 22B | Q4_K_M · 15.7 GB at 8K context · ~22 tok/s (est.) |
Devstral needs ~78 GB but this GPU has 128 GB. Rent a A100 (80 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Does the Apple M5 Max have enough VRAM for Devstral?
Yes, comfortably — Devstral-2 123B at Q4_K_M needs 77.9 GB at 8K context (74.3 GB weights + 3.6 GB KV cache/overhead), leaving ~18.1 GB of the Apple M5 Max's 96 GB usable memory, at ~4 tok/s (est.), with room for up to 32K context.
Which quantization of Devstral should I use on the Apple M5 Max?
Devstral-2 123B at Q4_K_M quantization needs 77.9 GB at 8K context (74.3 GB weights + 3.6 GB KV cache/overhead), estimated ~4 tokens/sec, up to 32K context.
Every Devstral size on the Apple M5 Max
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Devstral-2 123B | 77.9 GB | Runs | ~4 tok/s |
| Devstral Small 2505 24B | 16.6 GB | Runs | ~21 tok/s |
| Devstral Small 2 24B | 16.6 GB | Runs | ~21 tok/s |
Devstral on Other GPUs
- Devstral on Apple M4 Max
- Devstral on Apple M1 Ultra
- Devstral on NVIDIA DGX Spark
- Devstral on AMD Ryzen AI Max+ 395
Popular Models on the Apple M5 Max
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