What psu brand do you own?
Two rebranded CWT units from a local PC shop and one no-name unit. My old Athlon XP HTPC has a no-name 20-pin ATX PSU that was pulled from some OEM PIII/S423 P4/Socket A machine that had died. Yeah, I'd have picked a better unit but this one was free and was a pre-ATX12V unit that if the label is correct (hopefully it is
) supplies quite a bit more on the +5V rails than modern PSUs do. It previously had a Lite-On ATX12V unit that it killed before I realized the ASUS A7N8X-E board fed power into the CPU VRMs from +5DVC instead of +12VDC. This no-name unit probably isn't all that bad as has run for about a year and a half with absolutely no issues, unlike the random issues I got with the Lite-On unit's insufficient +5VDC output.