Written by Jakub Rusinowski · Last updated August 15, 2026
Yes, but it's tight — GPT-OSS 20B at MXFP4 needs 10.625 GB of the NVIDIA GeForce RTX 5070's 12 GB, leaving only ~1.4 GB, ~47 tok/s (est.).
| VRAM | 12 GB |
| Memory Bandwidth | 672 GB/s |
| Quant | VRAM needed | Fits 12 GB? | Max context |
|---|---|---|---|
| F16 | 41 GB | ✗ No | — |
| Q8_0 | 22.3 GB | ✗ No | — |
| Q6_K | 17.4 GB | ✗ No | — |
| Q5_K_M | 15.2 GB | ✗ No | — |
| Q4_K_M | 13.1 GB | ✗ No | — |
| Q3_K_M | 9.5 GB | ✓ Yes | 32K |
| Q2_K | 7.6 GB | ✓ Yes | 64K |
VRAM needed assumes a 4K-token context with an f16 KV cache; “Max context” is the largest window that still fits in 12 GB. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
| GPT-OSS 20B | MXFP4 · 10.625 GB · ~47 tok/s (est.) |
At 2 hrs/day, buying (~$549) beats renting at $0.34/hr after about 2.2 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.
Yes, but it's tight — GPT-OSS 20B at MXFP4 needs 10.625 GB of the NVIDIA GeForce RTX 5070's 12 GB, leaving only ~1.4 GB, ~47 tok/s (est.).
GPT-OSS 20B at MXFP4 quantization (10.625 GB), estimated ~47 tokens/sec.
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