Reply 40 of 45, by Doornkaat
maxtherabbit wrote on 2021-06-15, 02:54:As far as I know, the norm for ATX boards with 3.3v AGP is to just pass the power straight from the power header to the slot.
Perhaps that FIC board generates it's own 3.3v for some reason idk
Paadam wrote on 2021-06-15, 06:36:The early AT boards with AGP slots and some early ATX boards (Asus P2L97 comes to mind specifically) had VRM's that converted 5v to 3.3v and they had problems with more powerful (for the time) graphics cards. Asus even had official rework guide regarding the P2L97 mod early revisions that included unsoldering VRM leg and routing wire from ATX 3.3v pin to to a capacitor leg instead.
Not aware that any of the BX boards had such issues.
The +3.3V thing has been an issue with lots of 1997-1999 AGP motherboards. With 440bx boards especially those by Gigabyte seem affected. Gigabyte fixed the issue by implementing a pair of jumpers in later designs that would feed the AGP slot 3.3V directly from the ATX connector.