I'm at the end of my tether with this setup. Here's the tale as\nbriefly as I can summarise it:\n\nBeen running a 2000+ in this mobo for ages. Bought a 2600+ (333 FSB,\nT'Bred B), upgraded BIOS to latest version (CN), cleared CMOS, popped\nit in and worked like a charm. No option for 2600+ in the BIOS, so set\n"User Defined" with 166FSB, divider at 5:2:1, and 12.5 multiplier.\n\nAfter running like this for several weeks, pulled the whole lot into a\nnew case (with new PSU). It does the memory test OK but freezes before\nit starts finding the IDE devices. Put it all back in the old case (I\nthink EXACTLY as it was before) and doesn't work anymore. Tried it\noutside the case on a glass table with all disconnected except HD and\nAGP card but still no joy.\n\nEventually figured out I can get it to work by selecting "Failsafe\nDefaults". More tweaking showed it's stable at 100 FSB, 3:2:1 divider\nand 12.5 multiplier. I can increase the FSB gradually (moved divider\nto 4:2:1 to avoid overclocking PCI and AGP) and it starts flaking out\nat around 125 FSB. At lower FSB it nearly gets into Windows but then\nfreezes, any higher and it freezes right after the memory test.\n\nWhat have I done? I cleared the CMOS before powering it up in the new\ncase. I discovered that the old PSU was only 250W (I had thought I had\na 350W!). Interesting thing is the CPU was running at around 50-55\ndegrees idle in the old case (even with the case open). Now it's less\nthan 40 all the time.\n\nI've done several runs of MemTest with no problems (but only at 100FSB\nwhich clocks the CPU at 1250).\n\nI don't really understand about voltages. I have it at "CPU Default".\nDo I need to adjust one of these?\n\nKX7-333 rev 1.1\nSingle 512MB stick of Kingston PC2700\nAbit GeForce4 Ti4200 64MB\nMaxtor 80GB ATA133\nPioneer A105 DVDRW\nDLink Internal ADSL Modem\n550W PSU\nXP Home with SP1\n\nANY help or ideas are very much appreciated!