What GPU do I need to run IDEA-Research/ChatRex-7B?
7.3B parameters, published in BF16. View on Hugging Face
Set up ChatRex-7BChatRex-7B is published by IDEA-Research on Hugging Face, with 335,546 downloads and 14 likes to date. It's a ChatRexAuxForConditionalGeneration model built for image-text-to-text, published natively in BF16.
VRAM required & cheapest live GPU fit
Required VRAM = weight size at each precision, plus a fixed overhead for KV-cache, activations, and fragmentation. Full formula and assumptions: methodology.
| Precision | Weight size | Required VRAM | Cheapest live fit | GPUs needed | Est. $/hr (full fit) |
|---|---|---|---|---|---|
| BF16 | 13.6 GB | 16.3 GB | RTX A5000 | 1 | $0.176/hr |
| FP8 (quantized) | 6.8 GB | 8.2 GB | RTX 5060 Ti | 1 | $0.110/hr |
| INT4 (quantized) | 3.4 GB | 4.1 GB | RTX 5060 Ti | 1 | $0.110/hr |
A GPU is only matched to a row if its hardware supports that precision, and the primary recommendation is always a single-GPU fit when one exists.
INT4 requires a quantized checkpoint actually published for this model, check its Hugging Face page before relying on this row.
Cheapest way to run ChatRex-7B at its published (BF16) precision: 1× RTX A5000, at $0.176/hr per GPU ($0.176/hr total). Quantizing to FP8 or INT4 (rows above) can cost less, but requires a compatible quantized checkpoint to exist for this model.
ChatRex-7B: common questions
Does ChatRex-7B fit on a 24 GB GPU?
Yes. At BF16 it needs 16.3 GB of VRAM, so a 24 GB card holds it with 7.7 GB to spare. A 16 GB card is not enough for it at BF16.
What is the least VRAM ChatRex-7B can run in?
4.1 GB, at INT4 (quantized), which fits a 6 GB card, against 16.3 GB at BF16. That row assumes an INT4 checkpoint has actually been published for this model, so check its Hugging Face page before planning around it.
Does quantizing ChatRex-7B lower the GPU bill?
Yes. At BF16 the cheapest live fit is one RTX A5000 at $0.176/hr. At FP8 (quantized) it drops to one RTX 5060 Ti at $0.110/hr, provided a quantized checkpoint exists for it.
Weight-to-VRAM math, the fit rules, and how live prices are normalized: full methodology.
Related reading: RTX A5000 pricing and specs, The NVIDIA Inception program, explained, Google Colab alternatives for dedicated GPU access, Free GPU credits for students and researchers, and RunPod volume disk vs. network volume, compared.
