Cohere on AMD RDNA3
Can I run Command R 35B on an Radeon RX 7900 XTX?
Not at Q4_K_M — it needs 31.0 GB against 21.8 GB available. You would need 2 of these cards.
Won't fit
31.0 GB of 21.8 GB · 142%032 GB
Weights
20.1 GB
KV cache
10.0 GB
Runtime overhead
0.9 GB
Over the limit
9.2 GB
Short by 9.2 GB. You can run it with 21 of 40 layers on the Radeon RX 7900 XTX and the rest in system RAM, at roughly 2.84 tok/s — usable for batch work, painful for chat. A smaller quantisation or a shorter context is usually the better trade.
Generation2.84tok/s
Prompt processing738tok/s
Max context640tokens
KV per 1K tokens0GB
Every quantisation of Command R 35B on a Radeon RX 7900 XTX
Highlighted row is the highest quality that still fits at 8K context.
| Quantisation | bpw | Weights | Total | Verdict | Max ctx | tok/s |
|---|---|---|---|---|---|---|
| FP16 / BF16 | 16.00 | 65.2 GB | 76.0 GB | Won't fit | — | 0.60 |
| INT8 / W8A8 | 8.50 | 33.7 GB | 44.6 GB | Won't fit | — | 1.30 |
| Q8_0 (GGUF) | 8.50 | 33.7 GB | 44.6 GB | Won't fit | — | 1.30 |
| FP8 (E4M3) | 8.00 | 32.6 GB | 43.5 GB | Won't fit | — | 1.39 |
| Q6_K | 6.56 | 26.7 GB | 37.6 GB | Won't fit | — | 1.83 |
| Q5_K_M | 5.67 | 23.1 GB | 34.0 GB | Won't fit | — | 2.23 |
| AWQ 4-bit | 4.25 | 23.0 GB | 33.9 GB | Won't fit | — | 2.23 |
| GPTQ 4-bit | 4.25 | 23.0 GB | 33.9 GB | Won't fit | — | 2.23 |
| MXFP4 | 4.25 | 23.0 GB | 33.9 GB | Won't fit | — | 2.23 |
| Q5_K_S | 5.52 | 22.5 GB | 33.4 GB | Won't fit | — | 2.37 |
| Q4_K_M | 4.85 | 20.1 GB | 31.0 GB | Won't fit | 640 | 2.84 |
| Q4_K_S | 4.58 | 19.1 GB | 30.0 GB | Won't fit | 1K | 3.10 |
| Q4_0 | 4.55 | 19.0 GB | 29.9 GB | Won't fit | 2K | 3.11 |
| IQ4_XS | 4.25 | 17.9 GB | 28.8 GB | Won't fit | 2K | 3.60 |
| Q3_K_M | 3.91 | 16.7 GB | 27.6 GB | Won't fit | 3K | 4.25 |
| IQ3_M | 3.70 | 15.9 GB | 26.8 GB | Won't fit | 4K | 4.68 |
| IQ3_XXS | 3.06 | 13.7 GB | 24.5 GB | Won't fit | 6K | 7.03 |
| Q2_K | 2.63 | 12.1 GB | 23.0 GB | Won't fit | 7K | 11.6 |
| IQ2_XXS | 2.06 | 10.1 GB | 21.0 GB | Fits, but tight | 9K | 35.9 |
| IQ1_M | 1.75 | 9.0 GB | 19.8 GB | Fits, but tight | 10K | 38.8 |