Can I Run DeepSeek V4.1 on Apple M5 Max?
Written by Jakub Rusinowski · Last updated September 29, 2026
No — DeepSeek V4.1 Flash at Q4 (experimental) needs 172.8 GB at 8K context (171.5 GB weights + 1.3 GB KV cache/overhead), and the Apple M5 Max's 96 GB usable memory leaves it ~76.8 GB short. The cheapest card that runs it is the Apple M5 Ultra (512 GB).
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Apple M5 Max Specs
| VRAM | 128 GB unified memory |
| Memory Bandwidth | 614 GB/s |
DeepSeek V4.1 Flash on the Apple M5 Max: VRAM by quantization
| Quant | VRAM needed | Fits 128 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 | ✗ No | — | — |
| Q2_K | 94.7 GB | ✓ Yes | 16K | — |
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 (experimental) on the Apple M5 Max: 8K 172.8 GB ✗ · 32K 174.6 GB ✗ · 128K 181.5 GB ✗. Past 8K 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? 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 M5 Max provides (128 GB).
Nearest GPU That Fits
Apple M5 Ultra (512 GB VRAM).
DeepSeek V4.1 needs ~173 GB but this GPU has 128 GB. Rent a 8× H100 (640 GB)-class GPU by the hour instead of buying one:
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FAQ
Will DeepSeek V4.1 run on the Apple M5 Max?
No — DeepSeek V4.1 Flash at Q4 (experimental) needs 172.8 GB at 8K context (171.5 GB weights + 1.3 GB KV cache/overhead), and the Apple M5 Max's 96 GB usable memory leaves it ~76.8 GB short. The cheapest card that runs it is the Apple M5 Ultra (512 GB).
What GPU should I get instead to run 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 NVIDIA DGX Spark
- DeepSeek V4.1 on AMD Ryzen AI Max+ 395
Popular Models on the Apple M5 Max
VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Which GGUF quant should I download? (Q4 vs Q5 vs Q8)
Buying Guide
← Can I Run It? | DeepSeek V4.1 Model Page | Apple M5 Max GPU Page | VRAM calculator | Check Your Hardware