NVIDIA · 80 GB HBM3 · 3350 GB/s bandwidth ·
Google · 12.2B · model ctx up to 128K
Yes — the H100 80GB SXM5 (80 GB HBM3) can run gemma-3-12b-it. At Q4 with the default 8K context it needs ≈ 10.11 GB VRAM (weights 6.71 GB + KV cache 2.4 GB + 1 GB runtime overhead), which fits within 80 GB. Decode at Q4/8K: ≈ 177.7 tok/s (estimated, batch 1). FP16 (≈ 27.8 GB) also fits, at ≈ 48.9 tok/s (estimated). 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
8.91 GB
Yes
177.7est.
Q4
8K default
10.11 GB
Yes
177.7est.
Q4
32K
17.31 GB
Yes
177.7est.
FP16
4K
26.6 GB
Yes
48.9est.
FP16
8K default
27.8 GB
Yes
48.9est.
FP16
32K
35.0 GB
Yes
48.9est.
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).