Can I Run DeepSeek V3.2 671B on Apple M3 Ultra?
Written by Jakub Rusinowski · Last updated July 12, 2026
Not at Q4_K_M — that needs 414.9 GB at 8K context and the Apple M3 Ultra has 384 GB usable. Drop to Q3_K_M and it fits in 293.4 GB, with up to 64K of context.
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The numbers
| Model | DeepSeek V3.2 671B |
| Parameters | 671B/37B active |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 414.9 GB |
| Apple M3 Ultra usable memory | 384 GB |
| Verdict | Runs at a lower quant |
| Fits at | Q3_K_M (293.4 GB) |
| Max context | 64K |
DeepSeek V3.2 671B on the Apple M3 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 512 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 1371.4 GB | ✗ No | — | — |
| Q8_0 | 729.2 GB | ✗ No | — | — |
| Q6_K | 563.1 GB | ✗ No | — | — |
| Q5_K_M | 486.9 GB | ✗ No | — | — |
| Q4_K_M | 414.9 GB | ✗ No | — | — |
| Q3_K_M | 293.4 GB | ✓ Yes | 64K | — |
| Q2_K | 226.6 GB | ✓ Yes | 64K | — |
Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 512 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 M3 Ultra: 8K 414.9 GB ✗ · 32K 416.7 GB ✗ · 125K 423.4 GB ✗. Past 8K it no longer fits 512 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
What to do next
Quantize to Q3_K_M. That is the cheapest fix — it costs some quality but no money.
Running DeepSeek V3.2 671B on this card:
DeepSeek V3.2 671B needs ~415 GB but this GPU has 512 GB. Rent a 8× H100 (640 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.
DeepSeek V3.2 671B on nearby hardware
- Apple M2 Ultra (192 GB) — does not fit
All DeepSeek V3.2 sizes on the Apple M3 Ultra | DeepSeek V3.2 671B model page | Apple M3 Ultra GPU page | VRAM calculator | Check your hardware