If this is anything like my P5B Deluxe then 2x2GB will not work properly as 2GB sticks need a TRFC setting of around 53 onwards but the P5B Deluxe only goes to 42 in the BIOS making the system unstable even at stock speeds (and thus overclocking a complete impossibility). 1GB sticks only need a TRFC of 25-35 so are compatible
I've had to go with 4x1GB instead, which is a bit disappointing as I am at the boards limit now and can not upgrade the ram further
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