Originally Posted by Pluppo
I have had some problems trying to run a X1950CF and a X1900XT in crossfire with this board. I was running the X1900XT by itself with no problems with E6600 @ 3200 (400FSB, 1:1 RAM). Orthos for 16 hours with no errors, and system stable for a couple of weeks running all sorts of applications.
I lapped my E6600 and used Artic Silver 5 on it, as well as on the chipset coolers. I used AS5's instructions for dual core CPU's and applied a thin line down the middle of the E6600. Unfortunately, there was no temperature drop after this.
When I put in the X1950CF, the pc started rebooting or locking up when running 3D apps, so I thought this was a power supply issue. I tried lots of different drivers, and tried each card individually. I also went back to stock speeds for the E6600, but could still not run crossfire without getting reboots. I also did a lot of research on my PSU, and I believe that it should be powerful enough.
After a couple of days, the board wouldn't even POST! No beep, no video, all fans speed up & and small noise from my HDD, then nothing. So I took everything apart and tried to boot with only the P5W, E6600 and PSU. Still nothing. So I took off my Big Typhoon and saw that the thermal paste didn't look very well applied. I removed it and applied it again using a clean razor blade, and got a smooth thin layer on it.
After doing this, the PC booted, coretemp was showing that the CPU was 10 degrees cooler, and crossfire worked!! No more reboots or lockups at stock speeds. Then I tried OC'ing back to 3.2GHz with 400FSB, and the reboots are back when 3D apps are running.
I've been meaning to try OC'ing again in small steps and see if I can find a stable clock, but I'm realling confused about what is causing these reboots.
Any advise would be much appreciated.