like the title i have 1066 ram from ocz, i had to update the bios because it would only support 800 but now it gives me the option for 1066. i picked that and it shows 4gb which i have but it says 533 mhz in cpu-z and then it shows pc2-6400 on the memory slot 2 and 4....so whats going on
533 MHz x 2 = 1066Mhz DDR (double data rate). Jedec standards do not rate DDR2 higher than PC2 6400. The Mfg. rates it's RAM as PC28500 which must be set up manually in BIOS to run at those advertised speeds.