Autor: Jakub Rusinowski · Ostatnia aktualizacja: 12 lipca 2026
No — Command R Family doesn't fit the AMD Radeon RX 7900 XT's 20 GB. The cheapest card that runs it is the NVIDIA GeForce RTX 4090 (24 GB).
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| VRAM | 20 GB |
| Memory Bandwidth | 800 GB/s |
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 76.2 GB | ✗ No | — | — |
| Q8_0 | 43.4 GB | ✗ No | — | — |
| Q6_K | 34.9 GB | ✗ No | — | — |
| Q5_K_M | 31 GB | ✗ No | — | — |
| Q4_K_M | 27.3 GB | ✗ No | — | — |
| Q3_K_M | 21.1 GB | ✗ No | — | — |
| Q2_K | 17.7 GB | ✓ Yes | 4K | — |
Assumes a 4K-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 20 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 AMD Radeon RX 7900 XT: 8K 32.7 GB ✗ · 32K 64.9 GB ✗ · 125K 189.7 GB ✗. Past 8K it no longer fits 20 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.
Every Command R Family variant requires more VRAM than the AMD Radeon RX 7900 XT provides (20 GB).
NVIDIA GeForce RTX 4090 (24 GB VRAM).
Command R Family needs ~21 GB but this GPU has 20 GB. Rent a RTX 4090 (24 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.
No — Command R Family doesn't fit the AMD Radeon RX 7900 XT's 20 GB. The cheapest card that runs it is the NVIDIA GeForce RTX 4090 (24 GB).
The NVIDIA GeForce RTX 4090 (24 GB VRAM) is the cheapest upgrade that fits it.
| Size | VRAM | Verdict | Speed |
|---|---|---|---|
| Command R+ (104B) | 62.8 GB | Does not fit | — |
| Command R (35B) | 21.1 GB | Does not fit | — |
← Can I Run It? | Command R Family Model Page | AMD Radeon RX 7900 XT GPU Page | Check Your Hardware