Hi again, MechKB. I hear you. I started this new thread because I'm now going in a new direction. If it doesn't pan out I'll revert back to the earlier plan (& thread).
I simply can't get my 800Mhz RAM to do what it's supposed to do (it tests ok, btw), so I'm now thinking that if I must double-up, to 8Gb, I might as well buy new RAM at the higher, 1066MHz, clock speed that Asus says the board can easily handle. (Perhaps it will use, at 1066MHz, more than 50% of available memory.) But having trawled the web I see there are a lot of people out there who have tried exactly that but who only ended up in a world of grief. So far, no one seems to have achieved it.
As for the question of upping to 8Gb, I don't understand how that will solve anything since Windows 7 will only recognize a max 3.2Gb—and my system seems determined only to use half of that. Can you or anyone else elaborate on why putting in 8GB will make any difference?
The memory settings in my BIOS are all set to AUTO—and the P5E manual does indeed stipulate a change in bus frequency in order to accommodate what is, technically, an overclock. Unfortunately, its manual is very badly written in this aspect and I'm unable to discern the process with the necessary certainty. Hence, this new post—looking, specifically, for anyone who has conquered this specific anomaly.