Qwen on NVIDIA Blackwell
Can I run Qwen3 235B-A22B on an RTX 5090?
Not at Q4_K_M — it needs 135.1 GB against 29.3 GB available. You would need 5 of these cards.
Won't fit
135.1 GB of 29.3 GB · 461%0141 GB
Weights
132.8 GB
KV cache
1.5 GB
Runtime overhead
0.8 GB
Over the limit
105.8 GB
Short by 105.8 GB. You can run it with 19 of 94 layers on the RTX 5090 and the rest in system RAM, at roughly 3.83 tok/s — usable for batch work, painful for chat. A smaller quantisation or a shorter context is usually the better trade.
Generation3.83tok/s
Prompt processing1982tok/s
Max context0tokens
KV per 1K tokens0GB
Every quantisation of Qwen3 235B-A22B on a RTX 5090
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 | 437.9 GB | 440.2 GB | Won't fit | — | 1.05 |
| INT8 / W8A8 | 8.50 | 232.3 GB | 234.6 GB | Won't fit | — | 2.04 |
| Q8_0 (GGUF) | 8.50 | 232.3 GB | 234.6 GB | Won't fit | — | 2.04 |
| FP8 (E4M3) | 8.00 | 218.9 GB | 221.2 GB | Won't fit | — | 2.19 |
| Q6_K | 6.56 | 179.5 GB | 181.8 GB | Won't fit | — | 2.73 |
| Q5_K_M | 5.67 | 155.2 GB | 157.5 GB | Won't fit | — | 3.20 |
| Q5_K_S | 5.52 | 151.1 GB | 153.4 GB | Won't fit | — | 3.28 |
| Q4_K_M | 4.85 | 132.8 GB | 135.1 GB | Won't fit | — | 3.83 |
| Q4_K_S | 4.58 | 125.5 GB | 127.8 GB | Won't fit | — | 4.08 |
| Q4_0 | 4.55 | 124.7 GB | 127.0 GB | Won't fit | — | 4.11 |
| AWQ 4-bit | 4.25 | 118.0 GB | 120.3 GB | Won't fit | — | 4.37 |
| GPTQ 4-bit | 4.25 | 118.0 GB | 120.3 GB | Won't fit | — | 4.37 |
| MXFP4 | 4.25 | 118.0 GB | 120.3 GB | Won't fit | — | 4.37 |
| IQ4_XS | 4.25 | 116.5 GB | 118.8 GB | Won't fit | — | 4.42 |
| Q3_K_M | 3.91 | 107.2 GB | 109.5 GB | Won't fit | — | 4.89 |
| IQ3_M | 3.70 | 101.5 GB | 103.8 GB | Won't fit | — | 5.20 |
| IQ3_XXS | 3.06 | 84.1 GB | 86.4 GB | Won't fit | — | 6.65 |
| Q2_K | 2.63 | 72.4 GB | 74.7 GB | Won't fit | — | 8.12 |
| IQ2_XXS | 2.06 | 56.9 GB | 59.2 GB | Won't fit | — | 11.4 |
| IQ1_M | 1.75 | 48.4 GB | 50.7 GB | Won't fit | — | 14.9 |