Can it run?
Too heavy
Using Q4_K_M in vLLM
Fit status
Too heavy
Decode
2.1 tok/s
TTFT
93436 ms
Safe context
4K
Memory
419.1 GB / 16.0 GB
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Agentic Coding | F | Too heavy | 2.1 tok/s | 135907 ms | 4K |
| Chat | F | Too heavy | 2.1 tok/s | 50965 ms | 4K |
| Coding | F | Too heavy | 2.1 tok/s | 93436 ms | 4K |
| RAG | F | Too heavy | 2.1 tok/s | 169884 ms | 4K |
| Reasoning | F | Too heavy | 2.1 tok/s | 110424 ms | 4K |
How DeepSeek V3 671B (671B params) fits at each quantization level on RX 6900 XT 16GB (16.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 261.7 GB | Low | F0 |
Q3_K_S | 3 | 328.8 GB | Low | F0 |
NVFP4 | 4 | 375.8 GB | Medium | F0 |
Q4_K_M | 4 | 409.3 GB | Medium | F0 |
Q5_K_M | 5 | 483.1 GB | High | F0 |
Q6_K | 6 | 550.2 GB | High | F0 |
Q8_0 | 8 | 718.0 GB | Very High | F0 |
F16 | 16 | 1375.6 GB | Maximum | F0 |
