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 in the Nemotron family. 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
- Family
- Nemotron
- Parameters
- 46.8B
- Release Date
- 2025-05-22
- 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 |
|---|---|---|---|---|---|
| BF16est. | 16.00 | 102.9 GB | — | 93.58 GB | Brain floating point 16 — preferred for training |
est.= calculated VRAM estimate; no published GGUF file found for that quantization yet. Other rows are verified against real community uploads.
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 GB11 devices with unified memory can run Nemotron H 47B Reasoning 128K, including NVIDIA DGX H100, NVIDIA DGX A100 640GB, MacBook Pro 16" M5 Max (128 GB).
Runs great
— Plenty of headroom
Related 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 ~43 tok/s on AMD Instinct MI350X. Speed depends mainly on GPU memory bandwidth. Real-world results typically within ±20%.
tok/s = (bandwidth GB/s ÷ model GB) × efficiency
Example: NVIDIA B200 → 8000 ÷ 102.9 × 0.65 = ~51 tok/s
Estimated speed at BF16 (102.9 GB)
~51 tok/s~51 tok/s~43 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?
18 devices with unified memory can run Nemotron H 47B Reasoning 128K at BF16 (102.9 GB), including ASUS Ascent GX10, Asus ROG Flow Z13 (2025, Ryzen AI Max+ 395, 128 GB), Beelink GTR9 Pro (Ryzen AI Max+ 395, 128 GB), Framework Desktop (Ryzen AI Max+ 395, 128 GB). Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.