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Question Upgrading an HP ProDesk 400 G3 SFF ?

Oct 16, 2023
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Hello,

I've just purchased an HP ProDesk 400 G3 SFF (the i5 one) and would like to install an RX 6400 but I believe to do so, I need to upgrade the PSU.
I would appreciate help figuring out how much power I'd need, and how would I go about upgrading the PSU.

Thanks.