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
13.87 GB
Yes
28.9±est.
Q4
8K default
15.85 GB
Yes
28.9±est.
Q4
32K
27.73 GB
No
27.4±est.
FP16
4K
42.58 GB
No
3.2±est.
FP16
8K default
44.56 GB
No
2.9±est.
FP16
32K
56.44 GB
No
1.8±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
Quant
Weights
KV cache
Overhead
Total needed
V100 16GB PCIe VRAM
Q4
10.89 GB
3.96 GB
1 GB
15.85 GB
16 GB
FP16
39.6 GB
3.96 GB
1 GB
44.56 GB
16 GB
Other GPUs that run Qwen3.5-122B-A10B-Heretic-v2-MLX-mixed-3.8bit