AMD · 192 GB HBM3 · 5300 GB/s bandwidth ·
Google · 12.2B · model ctx up to 128K
Yes — the MI300X 192GB (192 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 192 GB. Decode at Q4/8K: ≈ 281.1 tok/s (estimated, batch 1). FP16 (≈ 27.8 GB) also fits, at ≈ 77.3 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
281.1est.
Q4
8K default
10.11 GB
Yes
281.1est.
Q4
32K
17.31 GB
Yes
281.1est.
FP16
4K
26.6 GB
Yes
77.3est.
FP16
8K default
27.8 GB
Yes
77.3est.
FP16
32K
35.0 GB
Yes
77.3est.
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).