it's with newegg's Adata 512mb pc3200 memory, biostar m7ncd (already flashed to latest bios), barton 2800 with <A HREF="http://www.supergooddeal.net/ebay/products/RW-2000-Black/pic07_l.jpg" target="_new"> this power supply </A>. it also has a 9800pro (cat 4.6), 160gig maxtor, floppy, and cdrw. it boots up fine and everything under 166fsb but it reboots by itself when i try to run 3dmark2003. i tried running sisoft sandra burn in test with the cpu but that failed after a few tries also. the cpu temperature though is low at about 45 C load with an alx800 and an 80mm case fan. weird thing is that it works at 165fsb but at 166 or above, it crashes. when i put on my vantec tornado that pushes 84cfm, it still crashes at 166 or above. so it seems like my cpu shouldn't be a problem. or can it? my agp is locked at 66. memory timing is at 7-3-3-2.5 and frequency is at 100%. does anyone know what's going on? btw, would it matter if my 512 (one stick) is on the first slot or the 2nd slot? also, why is it that when i set my fsb at 166, the POST screen reads the memory at 366. but when i set it to 165, 167 or 168, POST screen says DDR400? thanks for all of the help in advance.