Nemotron H 47B Reasoning 128K — Hardware Requirements & GPU Compatibility
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Nemotron H 47B Reasoning 128K is a 46.8B-parameter open language model from NVIDIA. At BF16 it needs about 102.94 GB of VRAM — see which GPUs and Macs can run it below.
372 downloads
21 likesSpecifications
- Publisher
- NVIDIA
- Parameters
- 46.8B
- Release Date
- 2025-07-11
- License
- Other
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HuggingFace
How Much VRAM Does Nemotron H 47B Reasoning 128K Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| BF16 | 16.00 | 102.9 GB | — | 93.58 GB | Brain floating point 16 — preferred for training |
Which GPUs Can Run Nemotron H 47B Reasoning 128K?
BF16 · 102.9 GBNemotron H 47B Reasoning 128K (BF16) requires 102.9 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 134+ GB is recommended. No single GPU has enough memory — multi-GPU or cluster setups are needed.
Which Devices Can Run Nemotron H 47B Reasoning 128K?
BF16 · 102.9 GB5 devices with unified memory can run Nemotron H 47B Reasoning 128K, including NVIDIA DGX H100, NVIDIA DGX A100 640GB, Mac Studio M4 Max (128 GB).
Runs great
— Plenty of headroom
Decent
— Enough memory, may be tightRelated Models
Frequently Asked Questions
- How much VRAM does Nemotron H 47B Reasoning 128K need?
Nemotron H 47B Reasoning 128K requires 102.9 GB of VRAM at BF16.
VRAM = Weights + KV Cache + Overhead
Weights = 46.8B × 16 bits ÷ 8 = 93.6 GB
KV Cache + Overhead ≈ 9.3 GB (at 2K context + ~0.3 GB framework)
VRAM usage by quantization
BF16102.9 GB- Can NVIDIA GeForce RTX 5090 run Nemotron H 47B Reasoning 128K?
No — Nemotron H 47B Reasoning 128K requires at least 102.9 GB at BF16, which exceeds the NVIDIA GeForce RTX 5090's 32 GB of VRAM.
- Can I run Nemotron H 47B Reasoning 128K on a Mac?
Nemotron H 47B Reasoning 128K requires at least 102.9 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 Nemotron H 47B Reasoning 128K locally?
Yes — Nemotron H 47B Reasoning 128K can run locally on consumer hardware. At BF16 quantization it needs 102.9 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is Nemotron H 47B Reasoning 128K?
At BF16, Nemotron H 47B Reasoning 128K can reach ~28 tok/s on AMD Instinct MI300X. Speed depends mainly on GPU memory bandwidth. Real-world results typically within ±20%.
tok/s = (bandwidth GB/s ÷ model GB) × efficiency
Example: AMD Instinct MI300X → 5300 ÷ 102.9 × 0.55 = ~28 tok/s
Estimated speed at BF16 (102.9 GB)
~28 tok/s~18 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of Nemotron H 47B Reasoning 128K?
At BF16, the download is about 93.58 GB.
- Which GPUs can run Nemotron H 47B Reasoning 128K?
No single consumer GPU has enough VRAM to run Nemotron H 47B Reasoning 128K at BF16 (102.9 GB). Multi-GPU or professional hardware is required.
- Which devices can run Nemotron H 47B Reasoning 128K?
5 devices with unified memory can run Nemotron H 47B Reasoning 128K at BF16 (102.9 GB), including Mac Pro M2 Ultra (192 GB), Mac Studio M2 Ultra (192 GB), Mac Studio M4 Max (128 GB), NVIDIA DGX A100 640GB. Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.