Can I run Qwen3-Coder-480B-A35B-Instruct-FP8 on an RTX 5090?

No

Even its smallest file (4-bit (estimate), 270 GB) is more than an RTX 5090 can hold (28.8 GB usable): it needs more than 8 of them.

Files and context on RTX 5090

Each file of Qwen3-Coder-480B-A35B-Instruct-FP8 (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.

Qwen3-Coder-480B-A35B-Instruct-FP8 on other hardware

Popular models that run on RTX 5090

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.