Can I Run Command R Family on NVIDIA GeForce RTX 4090?
作者： Jakub Rusinowski · 最后更新： 2026年9月29日
Only with offload — Command R (35B) at Q4_K_M needs 32.7 GB at 8K context (21.1 GB weights + 11.6 GB KV cache/overhead) against the NVIDIA GeForce RTX 4090's 24 GB, so part of it spills onto CPU/system RAM and speed drops sharply.
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NVIDIA GeForce RTX 4090 Specs
| VRAM | 24 GB |
| Memory Bandwidth | 1008 GB/s |
Command R (35B) on the NVIDIA GeForce RTX 4090: VRAM by quantization
| Quant | VRAM needed | Fits 24 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 81.5 GB | ✗ No | — | — |
| Q8_0 | 48.7 GB | ✗ No | — | — |
| Q6_K | 40.2 GB | ✗ No | — | — |
| Q5_K_M | 36.3 GB | ✗ No | — | — |
| Q4_K_M | 32.7 GB | ✗ No | — | — |
| Q3_K_M | 26.5 GB | ✗ No | — | — |
| Q2_K | 23 GB | ✓ Yes | 8K | — |
Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 24 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_K_M on the NVIDIA GeForce RTX 4090: 8K 32.7 GB ✗ · 32K 64.9 GB ✗ · 125K 189.7 GB ✗. Past 8K it no longer fits 24 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Command R Family on 256 GB of system RAM, CPU only: runs, but too slowly to be worth it.
Why It Does Not Fit
Every Command R Family variant requires more VRAM than the NVIDIA GeForce RTX 4090 provides (24 GB).
Nearest GPU That Fits
NVIDIA RTX 6000 Ada Generation (48 GB VRAM).
Command R Family needs ~33 GB but this GPU has 24 GB. Rent a A100 (40 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Will Command R Family run on the NVIDIA GeForce RTX 4090?
Only with offload — Command R (35B) at Q4_K_M needs 32.7 GB at 8K context (21.1 GB weights + 11.6 GB KV cache/overhead) against the NVIDIA GeForce RTX 4090's 24 GB, so part of it spills onto CPU/system RAM and speed drops sharply.
What GPU should I get instead to run Command R Family?
The NVIDIA RTX 6000 Ada Generation (48 GB VRAM) is the cheapest upgrade that fits it.
Every Command R Family size on the NVIDIA GeForce RTX 4090
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Command R+ (104B) | 65.7 GB | Does not fit | — |
| Command R (35B) | 32.7 GB | Runs at Q2_K | — |
Command R Family on Other GPUs
- Command R Family on NVIDIA GeForce RTX 3090
- Command R Family on AMD Radeon RX 7900 XTX
- Command R Family on Apple M4 Pro
- Command R Family on Apple M3
- Command R Family on Apple M2
Popular Models on the NVIDIA GeForce RTX 4090
- DeepSeek R1 on NVIDIA GeForce RTX 4090
- Qwen 3 on NVIDIA GeForce RTX 4090
- Qwen 2.5 Family on NVIDIA GeForce RTX 4090
VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Out of memory at long context (the KV cache, not the weights)
Buying Guide
← Can I Run It? | Command R Family Model Page | NVIDIA GeForce RTX 4090 GPU Page | VRAM calculator | Check Your Hardware