I have an ASUS P5WDH Deluxe. The "User Guide" booklet says that the mobo is designed for a CPU with a 1066 fsb. The ASUS web sight says the board (all modifications) will TAKE a Core 2 Quad Q9550 which has a 1333 fsb. Who is correct? ASUS has not bothered to answer me on this yet (5 days of trying). Anyone know the answer? I'd love to hear from you.I can take a guess... I suspect they're both right, in some respect..

The motherboard might accept a CPU with the 1333 FSB, but the CPU FSB will not run at that max. speed, unless maybe you overclock the board. The board you're talking about will feed a processor either 266.5 MHz or 200 MHz.. If you have your board's bus speed set at 266.5 MHz, a processor's FSB will allow 4 data transfers per each of those cycles (google "quad pumping") giving you "1066" (266.5x4)... If your board's bus is set at 200 MHz, then your processor front side bus will run at "800" (I think there is a VERSION of Pent. 4 with that FSB speed.)

When I checked the board specs., on Newegg they listed 1066/800 FSB speeds..


now say you overclock the board from 266 MHz to 333 then you would get the max. FSB speed (333x4) of that processor of 1333 MT/s (mega transfers) However, I'm not the most familiar person with overclocking so I don't know if you would be able kick the board up from 266 MHz all the way to 333 MHzThanks Blockhead, Your response makes sense. I think I'll try the faster processor because I have successfully overclocked my current Pentium D processor by at least 20%. It did pump the fsb from 800 mhz to 930 mhz. If this WORKS, I'll buy you a BREWSKI!you're welcome

Or as Count Dracula would say, you're Velcome