Can I Run DeepSeek V4.1 on Apple M2 Ultra?
Written by Jakub Rusinowski · Last updated July 12, 2026
Only with offload — DeepSeek V4.1 Flash at Q4 (experimental) needs 172.8 GB at 8K context (171.5 GB weights + 1.3 GB KV cache/overhead) against the Apple M2 Ultra's 144 GB usable memory, so part of it spills onto CPU/system RAM and speed drops sharply.
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Apple M2 Ultra Specs
| VRAM | 192 GB unified memory |
| Memory Bandwidth | 800 GB/s |
DeepSeek V4.1 Flash on the Apple M2 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 192 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 569.4 GB | ✗ No | — | — |
| Q8_0 | 303.1 GB | ✗ No | — | — |
| Q6_K | 234.3 GB | ✗ No | — | — |
| Q5_K_M | 202.7 GB | ✗ No | — | — |
| Q4_K_M | 172.8 GB | ✗ No | — | — |
| Q3_K_M | 122.4 GB | ✓ Yes | 256K | — |
| Q2_K | 94.7 GB | ✓ Yes | 512K | — |
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 192 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 (experimental) on the Apple M2 Ultra: 8K 172.8 GB ✗ · 32K 174.6 GB ✗ · 128K 181.5 GB ✗. Past 8K it no longer fits 192 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? DeepSeek V4.1 Flash on 128 GB of system RAM, CPU only: runs, but it is tight.
Why It Does Not Fit
Every DeepSeek V4.1 variant requires more VRAM than the Apple M2 Ultra provides (192 GB).
Nearest GPU That Fits
Apple M5 Ultra (512 GB VRAM).
DeepSeek V4.1 needs ~173 GB but this GPU has 192 GB. Rent a 8× H100 (640 GB)-class GPU by the hour instead of buying one:
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FAQ
Is the Apple M2 Ultra enough to run DeepSeek V4.1 locally?
Only with offload — DeepSeek V4.1 Flash at Q4 (experimental) needs 172.8 GB at 8K context (171.5 GB weights + 1.3 GB KV cache/overhead) against the Apple M2 Ultra's 144 GB usable memory, so part of it spills onto CPU/system RAM and speed drops sharply.
What's the cheapest GPU that runs DeepSeek V4.1?
The Apple M5 Ultra (512 GB VRAM) is the cheapest upgrade that fits it.
DeepSeek V4.1 on Other GPUs
- DeepSeek V4.1 on Apple M4 Max
- DeepSeek V4.1 on Apple M1 Ultra
- DeepSeek V4.1 on Apple M5 Max
- DeepSeek V4.1 on NVIDIA DGX Spark
Popular Models on the Apple M2 Ultra
VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Out of memory at long context (the KV cache, not the weights)
Buying Guide
← Can I Run It? | DeepSeek V4.1 Model Page | Apple M2 Ultra GPU Page | VRAM calculator | Check Your Hardware