I currently have an e4600 processor and 4Gb ram, The MB has two slots limited to 4GB each. I tried to install 2X 4Gb ram but noticed that CPU usage is almost always at 100% and the computer has slowed down drastically. It doesn't even want to load Chrome. Any help guys?
test each ramstick individually. but be aware not all motherboards will allow you to stack the ram in all sockets if its running faster than 800/1066.. or if the ram itself isnt made to run in sets of 4. my old amd would let me run 4 sticks of ddr2 800 but wouldnt boot with 4 ddr2 1066 because the 1066 was only supported via oc settings.
i droped it down to near 800 and it booted fine.
The CPUs support up to 64GB for a long time. But the older CPUs have the memory controller on the northbridge, making the motherboard the limiting factor. This no more the case for Core i's and Athlon64 or newer.
Anyway, you should either see capped size or reboots/shutdowns, but not 100% CPU usage. That is ususally a result of SW with problems.
PS: PAE setting in BIOS should have no effect on Windows 64 (other than preventing it's boot). Because 64-bit mode requires it, it's not optional.