I would like to understand more about the 3gb ram restriction for the P5B Deluxe MB. I've currently got 4gb installed. The manual indicates that the restriction has to do with the chipset allocation with 32 bit OS. That there is no restriction with a 64 bit OS. When I installed a beta of Vista, the restriction still existed. The manual seems to reference XP 64, so, maybe that is the difference.
Anyway, I would like further clarification on the issue, which by the way, does not seem limited to ASUS and the P5B.
Good information! Although, at present, I've still got XP SP2 installed. I'm going to give it a try when I install Vista again. Not adjusting the first time I installed Vista may explain why the available memory amount didn't change.