Why is my 1800 XP Unstable when not overclocked?

[bluearchtop]

I have:
1800 XP
MSI K7T266 Pro
Radeon LE 32 MB
512 MB DDR

When I choose bios defaults my system runs at 1.15 Ghz. It chooses a 100 Mhz bus instead of 133 Mhz. My system is stable when I run it this way.

When I override that (but leave everything else at auto) and set the bus to 133 Mhz, I run at 1.53 Ghz. It's stable for a while, but I seem to freeze often, or get the BSOD. I was installing VMWare and every time it would freeze up. When I went back to 1.15 Ghz, it would work just fine.

Does anyone know what I can check? I just bought this system, and I know I should be able to run stable at 1.5 Ghz! My CPU temp is always about 110-117 degrees. Doesn't seem to overheat. What else can I try?

 

[John]

Up the core voltage to 1.8 or 1.85v. try running a 2.7 DDR voltage as well.

 

[yomega]

Do you have PC2100 RAM or Just PC1600?

If you do have PC2100 it my be low quality and it might not even run at its rated speed.

If you have 2 DIMMs take one out and see if it works, then try the other one.

 

[manwithplan]

I had a similar problem recently when I was building a new system for someone. It turned out that the ram was faulty, surprising given it was crucial stuff...