Written by Jakub Rusinowski · Last updated July 12, 2026
Only with offload — DeepSeek V3 spills onto CPU/system RAM on the Apple M3 Ultra (512 GB), so expect a large speed penalty.
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| VRAM | 512 GB unified memory |
| Memory Bandwidth | 819 GB/s |
| Quant | VRAM needed | Fits 512 GB? | Max context |
|---|---|---|---|
| F16 | 1373.4 GB | ✗ No | — |
| Q8_0 | 731.2 GB | ✗ No | — |
| Q6_K | 565.1 GB | ✗ No | — |
| Q5_K_M | 488.8 GB | ✓ Yes | 32K |
| Q4_K_M | 416.9 GB | ✓ Yes | 64K |
| Q3_K_M | 295.3 GB | ✓ Yes | 64K |
| Q2_K | 228.5 GB | ✓ Yes | 64K |
VRAM needed assumes a 4K-token context with an f16 KV cache; “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.
Every DeepSeek V3 variant requires more VRAM than the Apple M3 Ultra provides (512 GB).
DeepSeek V3 needs ~414 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.
Only with offload — DeepSeek V3 spills onto CPU/system RAM on the Apple M3 Ultra (512 GB), so expect a large speed penalty.
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