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Can Mac Studio M2 Ultra 192GB run gemma-4-31B-it-FP8-block?

Apple · 192 GB LPDDR5 · 800 GB/s bandwidth · RedHatAI · 31.3B · model ctx up to NoneK

✅ Yes — Mac Studio M2 Ultra 192GB (192 GB) can run gemma-4-31B-it-FP8-block at Q4 (8K)
VRAM: 24.48 GB needed of 192 GB
Speed: ~14.4 tok/s (estimated)
AA · GreatComposite score: VRAM headroom × 0.5 + tok/s speed × 0.5. Q4 @ 8K context.
METAL
Estimates from memory-bandwidth formula; rows marked "measured" override. Methodology.

Fit & speed by quant and context

QuantContextVRAM neededFits?tok/s (decode)
Q44K21.35 GBYes14.4 ± est.
Q48K default24.48 GBYes14.4 ± est.
Q432K43.26 GBYes14.4 ± est.
FP164K66.73 GBYes4.0 ± est.
FP168K default69.86 GBYes4.0 ± est.
FP1632K88.64 GBYes4.0 ± 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 neededMac Studio M2 Ultra 192GB VRAM
Q417.22 GB6.26 GB1 GB24.48 GB192 GB
FP1662.6 GB6.26 GB1 GB69.86 GB192 GB

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