NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 — Hardware Requirements & GPU Compatibility
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NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 is a 560.5B-parameter open language model from NVIDIA. It supports a context window of up to 262,144 tokens. At BF16 it needs about 1233.15 GB of VRAM — see which GPUs and Macs can run it below.
794 downloads
22 likesSpecifications
- Publisher
- NVIDIA
- Parameters
- 560.5B
- Architecture
- NemotronHForCausalLM
- Context Length
- 262,144 tokens
- Vocabulary Size
- 131,072
- Release Date
- 2026-06-05
- License
- Other
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How Much VRAM Does NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| BF16 | 16.00 | 1233.2 GB | — | 1121.05 GB | Brain floating point 16 — preferred for training |
Which GPUs Can Run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16?
BF16 · 1233.2 GBNVIDIA Nemotron 3 Ultra 550B A55B Base BF16 (BF16) requires 1233.2 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 1604+ GB is recommended. No single GPU has enough memory — multi-GPU or cluster setups are needed.
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Frequently Asked Questions
- How much VRAM does NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 need?
NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 requires 1233.2 GB of VRAM at BF16.
VRAM = Weights + KV Cache + Overhead
Weights = 560.5B × 16 bits ÷ 8 = 1121 GB
KV Cache + Overhead ≈ 112.2 GB (at 2K context + ~0.3 GB framework)
VRAM usage by quantization
BF161233.2 GB- Can NVIDIA GeForce RTX 5090 run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16?
No — NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 requires at least 1233.2 GB at BF16, which exceeds the NVIDIA GeForce RTX 5090's 32 GB of VRAM.
- Can I run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 on a Mac?
NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 requires at least 1233.2 GB at BF16, which exceeds the unified memory of most consumer Macs. You would need a Mac Studio or Mac Pro with a high-memory configuration.
- Can I run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 locally?
Yes — NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 can run locally on consumer hardware. At BF16 quantization it needs 1233.2 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- What's the download size of NVIDIA Nemotron 3 Ultra 550B A55B Base BF16?
At BF16, the download is about 1121.05 GB.
- Which GPUs can run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16?
No single consumer GPU has enough VRAM to run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 at BF16 (1233.2 GB). Multi-GPU or professional hardware is required.
- Which devices can run NVIDIA Nemotron 3 Ultra 550B A55B Base BF16?
NVIDIA Nemotron 3 Ultra 550B A55B Base BF16 requires at least 1233.2 GB at BF16, which exceeds the unified memory of most consumer devices. A high-memory Mac Studio, Mac Pro, or multi-GPU desktop setup is recommended.