I had been running my FSB at 155MHz. I got to the desktop at 160MHz. So I thought I might as well try 165MHz. I bumped up my FSB to 165MHz and it posted but did not boot. I rebooted and turned it down and then it ran a scan disk and what seemed like hundreds of files were screwed. Then it rebooted itself and it said files were missing. Well I reformatted and loaded WinXP again. Well I thought it would be fine at 160MHz since I got to the desktop earlier. I was loading drivers and in the middle of loading soundcard drivers it rebooted. Same crap over again. Scan disk-corruped files-reboot-missing files. Reformatted again. Left at 155Mhz. Back where I started. Win98 never did that crap. When I would push it a little too far with Win98 it would just lock up and I could back it off and it would still be fine.