I have a problem with using the P5W DH Deluxe with the Q9300. I recently was using the Q6600 with X64 windows vista. I replaced the cpu, whenever i replace the cpu, the bios say no cpu detected and I click load default system settings and I get into windows fine. But that is only the first time. Afterwards, whenever I go to windows x64 i would get stop errors, even when I try to setup vista I would get stop errors. I do not know why this happens. Everything is tight. So the only way for me to use my pc is to plug my old q6600 in then take it back out then put my q9300 back in until it says new cpu detected then I use my computer. As soon as I shut it off and/or restart my pc, the computer it would not work and I would get all types of stop errors like driver_irq_not_less_or equal or page fault in non paged area. I don't know why Iget this errors. I apprecaite any help you can provide. I already updated to the latest version of the bios for the P5W DH Deluxe MB .thanks