Hi,
An m610 with one E5620 cpu was replaced with two X5660's. The goal: improve memory clock frequency. The E5620 supports up to 1067MHz, but the X5660 goes up to 1333MHz.
We're using M393B5273DH0-YH9 dimm modules. They are rated 1333MHz 4GB modules. We have 6 of these, and in the new configuration they are placed in A1, A2, A3, B1, B2 and B3.
So now we have a cpu that supports 1333MHz memory, we have 1333MHz memory and a configuration (dimm placement) that should support it also. Yet the BIOS lists the memory running at 1067MHz.
I've since increased the memory voltage from 1.35v to 1.5 in the bios, but that didn't help. The BIOS performance settings are at maximum. All firmware is up to date.
Does anyone have any clues as to why this system isn't running the memory at 1333MHz?