Can I Run GPT-OSS 120B on AMD Radeon RX 9070?
作者： Jakub Rusinowski · 最后更新： 2026年9月19日
No. GPT-OSS 120B needs 70.5 GB at Q4_K_M and the AMD Radeon RX 9070 has only 16 GB. No quantization we publish closes a gap that size.
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The numbers
| Model | GPT-OSS 120B |
| Parameters | 120B |
| Quantization | Q4_K_M |
| VRAM needed | 70.5 GB |
| AMD Radeon RX 9070 VRAM | 16 GB |
| Verdict | Does not fit |
GPT-OSS 120B on the AMD Radeon RX 9070: VRAM by quantization
| Quant | VRAM needed | Fits 16 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 234.7 GB | ✗ No | — | — |
| Q8_0 | 125.2 GB | ✗ No | — | — |
| Q6_K | 96.9 GB | ✗ No | — | — |
| Q5_K_M | 83.9 GB | ✗ No | — | — |
| Q4_K_M | 71.6 GB | ✗ No | — | — |
| Q3_K_M | 50.9 GB | ✗ No | — | — |
| Q2_K | 39.5 GB | ✗ No | — | — |
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 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 9070: 8K 71.9 GB ✗ · 32K 73.7 GB ✗ · 128K 81 GB ✗. Past 8K 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
Either step down to a smaller size in this family, or move to a NVIDIA A100 80GB (PCIe) (80 GB), the cheapest card we track with enough VRAM.
No compatible GPU? GPT-OSS 120B on 96 GB of system RAM, CPU only: runs, but it is tight.
Cheapest card we track with enough VRAM for GPT-OSS 120B:
GPT-OSS 120B needs ~71 GB but this GPU has 16 GB. Rent a A100 (80 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.
Other GPT-OSS sizes on the AMD Radeon RX 9070
- GPT-OSS 20B — runs (11.1 GB)
GPT-OSS 120B on nearby hardware
- Intel Arc B580 (12 GB) — does not fit
- AMD Radeon RX 7900 XT (20 GB) — does not fit
All GPT-OSS sizes on the AMD Radeon RX 9070 | GPT-OSS 120B model page | AMD Radeon RX 9070 GPU page | Check your hardware