Check if what your memory speed is set too in BIOS.
It can be set to 1:1, 1:2, 3:2, 4:5, 6:5 and a few more.
1:1 means that CPU fsb and memory speed will run at the same.
3:2 means that mem speed will be fsb*3 and CPU speed will be *2 or something like that.
Can't really remember how it was of the A7N8X Deluxe right now, but check the bios. There will be an option to set it. It might also be due to Automatic Options or something, set it to Advanced or User and change it.
That should do it, if that does not solve the problem take a look in the forums at
www.nforcershq.com 