Estimates from memory-bandwidth formula; rows marked "measured" override. Methodology.
Fit & speed by quant and context
Quant
Context
VRAM needed
Fits?
tok/s (decode)
Q4
4K
15.07 GB
No
0.7±est.
Q4
8K default
15.69 GB
No
0.6±est.
Q4
32K
19.44 GB
No
0.4±est.
FP16
4K
49.62 GB
No
—
FP16
8K default
50.25 GB
No
—
FP16
32K
54.0 GB
No
—
Fits = weights + KV(ctx) + 0.5 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
Quant
Weights
KV cache
Overhead
Total needed
MacBook Neo A18 Pro 8GB VRAM
Q4
13.44 GB
1.25 GB
0.5 GB
15.69 GB
8 GB
FP16
48.0 GB
1.25 GB
0.5 GB
50.25 GB
8 GB
Other GPUs that run Devstral-Small-2-24B-Instruct-2512