Jim said:
I'm in the process of rebuilding an older system using an ASROCK
4CoreDual-SATA2 motherboard. The manual has the ominous warning: "Please
do NOT use a 3.3V AGP card on the AGP slot of this motherboard! It may
cause permanent damage!"
I was using a Crucial branded model CTV750064A6. Might someone know of
an old video card reference site which includes voltages?
This 7500 has universal keying, so can work in a 1.5V or a
3.3V motherboard.
http://images.crucial.com/images/7500detail.jpg
For more info, try this page.
http://www.playtool.com/pages/agpcompat/agp.html
There are a few video cards which are mis-keyed by
the manufacturer. The SIS305, for example, has universal
keying, when in fact it is a 3.3V only card. So that card
was one of the ones to watch out for. The vast majority
of incorrect combinations, are detected by the fact the
video card won't sit flat in the slot. If the key/notch
things don't match, the card won't seat properly.
Back when this was happening, Asus added an "AGP_WARN" circuit
to their motherboards. It checked the TYPEDET# pin, to see if
it was an open circuit, as that indicated the card type was
likely to be 3.3V. (It had to check one other pin electrically,
in order to determine that an AGP card was inserted. I never
bothered to trace that down.) The AGP_WARN circuit would prevent
the ATX power supply from turning on. So that is supposed to
protect you from an evil SIS305 card.
Paul
