Can I run K2-Horizon-7B-GGUF on an RTX 5090?

Yes

Its BF16 file (18.0 GB) fits in the 28.8 GB an RTX 5090 can use, with room for ≈ 71K tokens of context.

Full analysis of K2-Horizon-7B-GGUF Everything that runs on RTX 5090 Get the BF16 file on Hugging Face

ollama run hf.co/IFM/K2-Horizon-7B-GGUF:BF16

Files and context on RTX 5090

Each file of K2-Horizon-7B-GGUF (and of GGUF versions the site has analyzed), and how much context fits next to it, with the context cache in 16-bit or 8-bit.

File	Size	On RTX 5090	Context (16-bit)	Context (8-bit)
BF16	18.0 GB	Fits	71K	143K
Q8_0	9.57 GB	Fits	127K	255K
Q6_K	7.39 GB	Fits	142K	284K
Q5_K_M	6.47 GB	Fits	148K	296K
Q5_0	6.34 GB	Fits	149K	298K
Q4_K_M	5.59 GB	Fits	154K	307K

K2-Horizon-7B-GGUF on other hardware

NVIDIA H100Yes
RTX 5090Yes
RTX 4090Yes, just
RTX 3090Yes, just
RTX 5060 Ti 16 GBYes
RTX 3060 12 GBYes, just
RTX 4060Yes, just
Mac with 32 GBYes, just
Mac with 64 GBYes
Mac with 128 GBYes

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Assumes 90% of the card's memory is usable and at least 4K tokens of context for one conversation, with the context cache in 16-bit unless noted. Fits leaves at least 20% of that memory for context; Tight leaves less.