Hy4 Preview — Hardware Requirements & GPU Compatibility
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Hy4 Preview is a 780.0B-parameter open language model from Tencent. It supports a context window of up to 1,048,576 tokens. At BF16 it needs about 1560.71 GB of VRAM — see which GPUs and Macs can run it below.
6.2K downloads
440 likesSpecifications
- Publisher
- Tencent
- Parameters
- 780.0B
- Architecture
- HYV4ForCausalLM
- Context Length
- 1,048,576 tokens
- Vocabulary Size
- 120,832
- Release Date
- 2026-08-27
- License
- Apache 2.0
Get Started
HuggingFace
How Much VRAM Does Hy4 Preview Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| BF16est. | 16.00 | 1560.7 GB | 1811.5 GB | 1559.92 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 Hy4 Preview?
BF16 · 1560.7 GBHy4 Preview (BF16) requires 1560.7 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 2029+ GB is recommended. Using the full 1049K context window can add up to 250.8 GB, bringing total usage to 1811.5 GB. No single GPU has enough memory — multi-GPU or cluster setups are needed.
Where to Download Hy4 Preview
Community quantizations of this model — GGUF for llama.cpp, Ollama, and LM Studio, plus AWQ/MLX variants where available.
Frequently Asked Questions
- How much VRAM does Hy4 Preview need?
Hy4 Preview requires 1560.7 GB of VRAM at BF16. Full 1049K context adds up to 250.8 GB (1811.5 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 780.0B × 16 bits ÷ 8 = 1559.9 GB
KV Cache + Overhead ≈ 0.8 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 251.6 GB (at full 1049K context)
VRAM usage by quantization
BF161560.7 GBBF16 + full context1811.5 GB- Can NVIDIA GeForce RTX 5090 run Hy4 Preview?
No — Hy4 Preview requires at least 1560.7 GB at BF16, which exceeds the NVIDIA GeForce RTX 5090's 32 GB of VRAM.
- Can I run Hy4 Preview on a Mac?
Hy4 Preview requires at least 1560.7 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 Hy4 Preview locally?
Yes — Hy4 Preview can run locally on consumer hardware. At BF16 quantization it needs 1560.7 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- What's the download size of Hy4 Preview?
At BF16, the download is about 1559.92 GB.
- Which GPUs can run Hy4 Preview?
No single consumer GPU has enough VRAM to run Hy4 Preview at BF16 (1560.7 GB). Multi-GPU or professional hardware is required.
- Which devices can run Hy4 Preview?
Hy4 Preview requires at least 1560.7 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.