For those of you struggling to get 4GB or more RAM to show up on your systems with Vista 64bit, I got my 8GB working by installing the patches recommended above, and also switched, in BIOS,
my
ACPI to v2.0, (the highest it would go) and
memswapping to ENABLE. Before, the memswap had made Vista so unstable I couldn't even open Notepad without it freezing and refusing to work, and task manager wouldn't close it.
But with the changes above, it's been stable for the last 24 hours and everything seems to be working fine...and fast.
I'll be talking with my system's builder, allpczone (consumerlx.com) tomorrow about it to see if they have different recommendations, but for now it's working. Will post back if anything changes.
Also, this step was recommended by several people who said it fixed the memory recognition problem:
http://support.microsoft.com/kb/929777
I read this on the Microsoft tech forum:
http://forums.microsoft.com/technet...4&siteid=17&sb=0&d=1&at=7&ft=11&tf=0&pageid=8
my rig:
ASUS P5W DH DELUXE, 8GB Kingston DDR2 667, supposedly the latest BIOS, I haven't checked that yet though.