kt4 ultra max FSB 112mhz w/ xp2000+
for over a year i've been running my system with the FSB tweaked so that my xp 2000+ was running at about 1760mhz very stably. I recently installed a Radeon 9800xt and while tweaking my bios the system became very unstable. while tweaking after the radeon installation, I had set the fsb set to 141mhz (inadvertantly) thats when the instability started occuring. the system will reboot spiratically, lock up, etc. I've found that if I underclock the FSB to 112mhz that the system performs well without any problems to speak of. I have tried removing all peripherals from the PCI bus, and have also swapped out my video card for the previous one that worked well (geforce ti200), reset the bios to defaults and one by one tweaked it back to where is should be, but none of those efforts seems to allow me to clock my fsb any higher than 112/113mhz with stability, leaving my processor underclocked at 1400mhz (from 1.66). I have reseated my ram, and bios reports that my power ratings are within range of where they should be. here is my configuration:
-xp pro sp1
-MSI KT4-ulta (6590) with the latest via 4 in 1 chipset drivers
-Athlon XP 2000+ w/ thermaltake volcano 6cu+, and Silicone Heatsink goo
-SB live! plat.
-512MB geil pc3200 cas 2.5 6-3-3 2t DDR ram (set to SPD in bios) (will only run at 333 wont post at 400mhz.. even tho the sticker on the ram says its pc3200, a windows based diag (one that I was refered to from here, cant remember the name) I ran says its only pc2700) - I ran docmem 2.0 through 30 loop cycles of the burn-in test with the DDR set at 333mhz with 0 faults.
-bios has been tested in both default configs, and tweaked configs.. with no increase in stability when I tried to move the FSB above 113mhz.. I also tried reducing the DDR FSB to 200 and that didn't help me move the FSB above 113 either.
-antec 430W power supply.. bios reports that it is within parameters.
CPU after about 14 hours of looped benchmarking heats out at 48C (42C idle) my case temp runs just about 10-12 degrees above ambient room temp at (82F-85F) - I've been watching this parameter in bios closely as I have been testing the system, and I have not seen the CPU temp go above 50C-52C no matter how high I set the fsb (highest i've set it is 141mhz).
I've been reading the posts in here for about a week to see if I could enlighten myself, but none of the previous posts recommendations that I have tried have seemed to work. seems like recommendations I've read about stability problems state that either the power supply is bad/not big enough or improper cooling as the cause most of the problems. but mine was working fine for a whole year with the processor overclocked to 1.76ghz (from 1.66) until I overclocked the FSB to 141 (which I acctually did by mistake).. then it went kaput.
about the only thing I can think of that I've seen suggested here previously that I havn't tried is reseating the cooling fan. but I'm reluctant to mess with it considering the potential to damage the chip when reattaching it, so I've been saving it for last.
I would appreciate any insight that you experts can provide.. I'm just about ready to dump the MB/processor and buy a new one.. but I'm concerned that maybe its the ram.. then I'd be wasting my money on the MB/proc. just to have the same problem with a new setup.
Thank you for your consideration!!