Yes — the DGX Spark (GH200 480GB) (480 GB LPDDR5X) can run NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4. At Q4 with the default 8K context it needs ≈ 304.05 GB VRAM (weights 302.5 GB + KV cache 0.55 GB + 1 GB runtime overhead), which fits within 480 GB. Decode at Q4/8K: ≈ 5.8 tok/s (estimated, batch 1). FP16 needs ≈ 1101.55 GB — does not fit on this card. Estimates come from memory-bandwidth math; rows tagged measured override estimates. Relative ranking is more reliable than absolute tok/s. Methodology. Buy DGX Spark (GH200 480GB) on Amazon →
Fit & speed by quant and context
Quant
Context
VRAM needed
Fits?
tok/s (decode)
Q4
4K
303.77 GB
Yes
5.8±est.
Q4
8K default
304.05 GB
Yes
5.8±est.
Q4
32K
305.7 GB
Yes
5.8±est.
FP16
4K
1101.28 GB
No
0.9±est.
FP16
8K default
1101.55 GB
No
0.9±est.
FP16
32K
1103.2 GB
No
0.9±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
DGX Spark (GH200 480GB) VRAM
Q4
302.5 GB
0.55 GB
1 GB
304.05 GB
480 GB
FP16
1100.0 GB
0.55 GB
1 GB
1101.55 GB
480 GB
Other GPUs that run NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4
No catalog GPU fully fits NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4 at Q4/8K — see the model page for offload estimates. model page