Actually, you only really need a good 1000W unit for a 5090:
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Review: NVIDIA GeForce RTX 5090 Founders Edition (reference) (Page 5)
Oh boy, has it been a wait and while, but today is the day that we finally get to review the GeForce RTX 5090.This flagship graphics card aimed at thoroughbred gamers is armed and stuffed with the latest technologies and that mighty Blackwell GB202 graphics processor.www.guru3d.com
Companies tend to overspec on the basis many people buy weaker PSU's.
Frankly, were it me I'd spend £130-150 on something like a 1000W Superflower Leadex III 3.1.
Thanks @Gray2233 makes sense to save a bit more there too then. Much appreciated.