Nemotron H 8B Reasoning 128K — Hardware Requirements & GPU Compatibility
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Nemotron H 8B Reasoning 128K is a 8.1B-parameter open language model from NVIDIA. At BF16 it needs about 17.82 GB of VRAM — see which GPUs and Macs can run it below.
628 downloads
26 likesSpecifications
- Publisher
- NVIDIA
- Parameters
- 8.1B
- Release Date
- 2025-07-11
- License
- Other
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HuggingFace
How Much VRAM Does Nemotron H 8B Reasoning 128K Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| BF16 | 16.00 | 17.8 GB | — | 16.20 GB | Brain floating point 16 — preferred for training |
Which GPUs Can Run Nemotron H 8B Reasoning 128K?
BF16 · 17.8 GBNemotron H 8B Reasoning 128K (BF16) requires 17.8 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 24+ GB is recommended. 6 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroom
Which Devices Can Run Nemotron H 8B Reasoning 128K?
BF16 · 17.8 GB21 devices with unified memory can run Nemotron H 8B Reasoning 128K, including NVIDIA DGX H100, NVIDIA DGX A100 640GB, Mac Mini M4 Pro (24 GB).
Runs great
— Plenty of headroomRelated Models
Frequently Asked Questions
- How much VRAM does Nemotron H 8B Reasoning 128K need?
Nemotron H 8B Reasoning 128K requires 17.8 GB of VRAM at BF16.
VRAM = Weights + KV Cache + Overhead
Weights = 8.1B × 16 bits ÷ 8 = 16.2 GB
KV Cache + Overhead ≈ 1.6 GB (at 2K context + ~0.3 GB framework)
VRAM usage by quantization
BF1617.8 GB- Can I run Nemotron H 8B Reasoning 128K on a Mac?
Nemotron H 8B Reasoning 128K requires at least 17.8 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 8B Reasoning 128K locally?
Yes — Nemotron H 8B Reasoning 128K can run locally on consumer hardware. At BF16 quantization it needs 17.8 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is Nemotron H 8B Reasoning 128K?
At BF16, Nemotron H 8B Reasoning 128K can reach ~164 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~37 tok/s. 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 ÷ 17.8 × 0.55 = ~164 tok/s
Estimated speed at BF16 (17.8 GB)
~164 tok/s~37 tok/s~122 tok/s~101 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 8B Reasoning 128K?
At BF16, the download is about 16.20 GB.
- Which GPUs can run Nemotron H 8B Reasoning 128K?
6 consumer GPUs can run Nemotron H 8B Reasoning 128K at BF16 (17.8 GB). Top options include NVIDIA GeForce RTX 5090, AMD Radeon RX 7900 XT, AMD Radeon RX 7900 XTX. 1 GPU have plenty of headroom for comfortable inference.
- Which devices can run Nemotron H 8B Reasoning 128K?
21 devices with unified memory can run Nemotron H 8B Reasoning 128K at BF16 (17.8 GB), including Mac Mini M4 (32 GB), Mac Mini M4 Pro (24 GB), Mac Mini M4 Pro (48 GB), Mac Pro M2 Ultra (192 GB). Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.