Using the pair of modules, we ran it at default SPD which is CAS 3, 8-3-3 (tRAS=8, our convention of putting tRAS first). As the CPU is a 800FSB part, we lowered the multiplier and increase the FSB to 266MHz. We also run the DDR2 in sync with the CPU FSB. Thus we are actually running at DDR533. CPU speed = 3.72GHz (14 x 266).