NVIDIA · 32 GB GDDR7 · 1792 GB/s bandwidth ·
Alibaba · 32.8B · model ctx up to 128K
Yes — the RTX 5090 32GB (32 GB GDDR7) can run Qwen2.5-32B-Instruct. At Q4 with the default 8K context it needs ≈ 25.6 GB VRAM (weights 18.04 GB + KV cache 6.56 GB + 1 GB runtime overhead), which fits within 32 GB. Decode at Q4/8K: ≈ 34.8 tok/s (estimated, batch 1). FP16 needs ≈ 73.16 GB — does not fit on this card. Estimates come from memory-bandwidth math; rows tagged measured override estimates. Relative ranking is more reliable than absolute tok/s. Methodology.
Fit & speed by quant and context
Quant
Context
VRAM needed
Fits?
tok/s (decode)
Q4
4K
22.32 GB
Yes
34.8est.
Q4
8K default
25.6 GB
Yes
34.8est.
Q4
32K
45.28 GB
No
49.6est.
FP16
4K
69.88 GB
No
5.7est.
FP16
8K default
73.16 GB
No
5.2est.
FP16
32K
92.84 GB
No
3.2est.
Fits = weights + KV(ctx) + 1 GB overhead ≤ 95% of VRAM. Measured
anchors are context-agnostic; the fit verdict is recomputed per context. A missing tok/s
means the model is far beyond this card (offload-only territory).