BIOS ignores memory SPD settings

I've just checked my memory timings with CPU-Z and it shows my memory to be running at 2-3-3-5 instead of 2-2-2-5 (as picked up by its SPD detection). My BIOS is pretty much all default values (Auto for all memory related settings). As i'm not overclocking (specifically not increasing FSB), should I set the BIOS to manual for memory and change the settings to 2-2-2-5? The memory is rated to run at those timings for a 200MHz FSB (it's the memory in my sig). The voltage to the memory is set correctly according to the Corsair product info for these sticks (2.75V).

Yeah, just set the timings manually, then run something like memtest or prime95 to make sure it's stable.