Can I Run DeepSeek V4.1 on AMD Ryzen AI Max+ 395?
Written by Jakub Rusinowski · Last updated July 12, 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 AMD Ryzen AI Max+ 395's 128 GB leaves it ~44.8 GB short. The cheapest card that runs it is the Apple M5 Ultra (512 GB).
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AMD Ryzen AI Max+ 395 Specs
| VRAM | 128 GB |
| Memory Bandwidth | 256 GB/s |
DeepSeek V4.1 Flash on the AMD Ryzen AI Max+ 395: 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 | ✓ Yes | 64K | — |
| Q2_K | 94.7 GB | ✓ Yes | 256K | — |
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. 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 AMD Ryzen AI Max+ 395: 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 AMD Ryzen AI Max+ 395 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
Can I run DeepSeek V4.1 on the AMD Ryzen AI Max+ 395?
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 AMD Ryzen AI Max+ 395's 128 GB leaves it ~44.8 GB short. The cheapest card that runs it is the Apple M5 Ultra (512 GB).
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 AMD Ryzen AI Max+ 395
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 | AMD Ryzen AI Max+ 395 GPU Page | VRAM calculator | Check Your Hardware