I fried my P4C800-E Deluxe by trying to update the bios in Windows (with AsusUpdate... I STRONGLY advise against using it. I've flashed a hundred bioses in my day the old-fashioned floppy disk way, with ZERO problems. Just a word to the wise). After installing the new motherboard (everything else was identical, of course), and flashing it with 1015, I can now (same bios settings as far as I can recall) clock it a little higher. Not hundreds of mhz, but enough to go from 3.5x to 3.6x...hey I was impressed. In the interest of total disclosure, I will mention that I used Arctic Silver 5 instead of the older Arctic Silver on the CPU, but that would be the only difference. Just wanted to pass along my experience. And, once again, I STRONGLY recommend NOT updating your bios in Windows. That is all.