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
17.52 GB
Yes
710.6±est.
Q4
8K default
17.53 GB
Yes
710.6±est.
Q4
32K
17.62 GB
Yes
710.6±est.
FP16
4K
61.02 GB
Yes
195.4±est.
FP16
8K default
61.03 GB
Yes
195.4±est.
FP16
32K
61.12 GB
Yes
195.4±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
H100 80GB SXM5 VRAM
Q4
16.5 GB
0.03 GB
1 GB
17.53 GB
80 GB
FP16
60.0 GB
0.03 GB
1 GB
61.03 GB
80 GB
Other GPUs that run Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16