> Actually having just had another look at the card, it doesn't have the
> AGP4x key, just the 8x one, so I guess it won't work
Actually, there is no 4x key or 8x key. There's a 3.3V key on the side
of the connector closest to where the monitor plugs in, and there's a
1.5V key on the other side.
Old 3.3V AGP cards (1x/2x) have only the 3.3V key.
AGP 4x and 8x cards have the 1.5V key, and possibly both. (Both my old
4x AGP Ti4200 and my new 8x AGP FX5900 have both keys.)
Despite using 0.8V signaling, AGP 8x cards are keyed the same as 1.5V,
probably to make it easier to make cards that will work at both speeds.
AFAIK, the spec says that AGP 8x cards are required to tolerate
the 1.5V signal, although they're not required to work. In my (limited)
experience, though, I've never seen an 8x card not work in a 4x board.