Funny, I was advised to buy a ASUS P5B-VM since I need 8MB memory.
I have that board. Do NOT get it for >3gb of memory.
To get >3gb of mem you need to enable "extended memory remapping" in the bios
When you do that, the system will be very very unusably slow.
So basically, Asus went cheap on the memory controllers on the board, and that's why it not only doesn't support 8GB, but it doesn't support more than 2GB with full performance.
um, up to 3gb seems fine. there are 4 dimms but only 3 get recognized when not using the "memory remapping" in bios which they haven't seemed to release a working version of yet. As to if and when that might be, Asus is silent.
Shawn