Can I Run InternLM 3 20B Instruct on AMD Radeon RX 7800 XT?
作者： Jakub Rusinowski · 最后更新： 2026年9月19日
Yes. InternLM 3 20B Instruct needs 12.1 GB at Q4_K_M and the AMD Radeon RX 7800 XT has 16 GB, leaving about 3.9 GB of headroom, at roughly 28 tok/s (estimated) with room for up to 8K of context.
See what else this hardware can run →
The numbers
| Model | InternLM 3 20B Instruct |
| Parameters | 20B |
| Quantization | Q4_K_M |
| VRAM needed | 12.1 GB |
| AMD Radeon RX 7800 XT VRAM | 16 GB |
| Verdict | Runs |
| Max context | 8K |
| Estimated speed | ~28 tok/s |
InternLM 3 20B Instruct on the AMD Radeon RX 7800 XT: VRAM by quantization
| Quant | VRAM needed | Fits 16 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 41.6 GB | ✗ No | — | — |
| Q8_0 | 22.8 GB | ✗ No | — | Build for this |
| Q6_K | 18 GB | ✗ No | — | — |
| Q5_K_M | 15.8 GB | ✓ Yes | 4K | — |
| Q4_K_M | 13.7 GB | ✓ Yes | 8K | Build for this |
| Q3_K_M | 10.1 GB | ✓ Yes | 32K | — |
| Q2_K | 8.2 GB | ✓ Yes | 32K | — |
Assumes a 4K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 16 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 7800 XT: 8K 14.5 GB · 32K 19.2 GB ✗. Past 32K it no longer fits 16 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
What to do next
Nothing to change — run it at Q4_K_M. If you want more capability, check whether the next size up also fits.
No compatible GPU? InternLM 3 20B Instruct on 24 GB of system RAM, CPU only: runs.
Running InternLM 3 20B Instruct on this card:
At 2 hrs/day, buying (~$499) beats renting at $0.34/hr after about 2.0 years.
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
Other InternLM 3 sizes on the AMD Radeon RX 7800 XT
- InternLM 3 8B Instruct — runs (5.3 GB)
InternLM 3 20B Instruct on nearby hardware
- Intel Arc B580 (12 GB) — runs at a lower quant
- AMD Radeon RX 7900 XT (20 GB) — runs
All InternLM 3 sizes on the AMD Radeon RX 7800 XT | InternLM 3 20B Instruct model page | AMD Radeon RX 7800 XT GPU page | Check your hardware