Hi, Just give me your ears for a while. My set up is K7N2 Delta ilsr mobo Athlon 3200+ with Thermaltake volacano 10+ all copper heat sink Kingston DDR 400 512 MB running in dual channel mode 2 Seagate 120 GB SATA HDD configured in RAID 0 mode FX 5600 256 mb graphics Antec True Power 430 watts SMPS Now, my problem is that my PC just won't run unless I underclock(!) my 3200 + . I've tried loading default values in the BIOS, flashed it, pampered the cab with lots of cooling fans and even tried leaving my Antec server cab open. . I have a mammoth cab, 6 fans in total for the cab. At boot up the cpu temp is around 43 C and it hovers around 55 C to 61 C after windows boots up(XP pro sp1).The moment I start doing the least CPU intensive programme, the CPU just freezes. No BSOD, no nothing. It just locks up. The thing is , it runs almost perfectly when the CPU FSB is underclocked at 333 mhz. But I bought a 400 FSB cpu and u can start to get my problem. Any bright ideas, anyone? ANYONE? HELP!!!