Some BIOS read the SPD wrong and set to a default and you have to manualy go in and set it.
the ram may be capable of running at that speed np but the SPD may show the lowest value.
It should tell you specifically where in your mobo manual.
In mine its an area called CELL menu.
It took me awhile to get mine straightened out it was running under speed also but in my case it required i flash it.. was a bug.
you probably have to go change the settings manually, just make sure you got the correct RAM and
check the voltages make sure your in safe range.
start reading at 5.1 under manual tab then save it unless you have this same version of the mobo manual. talks about settings
Core i7 920, MSI X58 Plat. SLI, 6 Gigs Mushkin 1333,
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