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
428.06 GB
No
—
Q4
8K default
432.93 GB
No
—
Q4
32K
462.18 GB
No
—
FP16
4K
1513.67 GB
No
—
FP16
8K default
1518.55 GB
No
—
FP16
32K
1547.8 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
422.18 GB
9.75 GB
0.5 GB
432.93 GB
8 GB
FP16
1507.8 GB
9.75 GB
0.5 GB
1518.55 GB
8 GB
Other GPUs that run GLM-5.1
No catalog GPU fully fits GLM-5.1 at Q4/8K — see the model page for offload estimates. model page