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Can RTX 3090 24GB run gemma-4-31B-it?

NVIDIA · 24 GB GDDR6X · 936 GB/s bandwidth · Google · 30.7B · model ctx up to 256K

Partly — gemma-4-31B-it at Q4 fits the RTX 3090 24GB (24 GB GDDR6X) at 4K context (≈ 20.96 GB) but not at the default 8K (≈ 24.03 GB needed). Use a shorter context or partial offload. Decode at Q4/8K: ≈ 55.3 tok/s (estimated, batch 1). FP16 needs ≈ 68.54 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

QuantContextVRAM neededFits?tok/s (decode)
Q44K20.96 GBYes19.4 est.
Q48K default24.03 GBNo55.3 est.
Q432K42.45 GBNo17.7 est.
FP164K65.47 GBNo2.0 est.
FP168K default68.54 GBNo1.9 est.
FP1632K86.96 GBNo1.2 est.

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).

VRAM breakdown at 8K context

QuantWeightsKV cacheOverheadTotal neededRTX 3090 24GB VRAM
Q416.89 GB6.14 GB1 GB24.03 GB24 GB
FP1661.4 GB6.14 GB1 GB68.54 GB24 GB

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