XP 3500 socket 939 high cpu temps?

I just completed upgrading to an Athlon 3500 90nm winchester core, with an
MSI Neo2 Platinum mb this past weekend.

I got the oem processor, along with a Thermalrite XP90 heatsink, with a 80mm
( i think) fan.
I used Arctic Silver 3.

My cpu temp as reported by corecenter, and in the bios, idles around 46-48C,
and gets into low 50's under load. System temp is 25C.
This is the first time in my many system upgrades that I have had a heat
problem. My Athlon XP 2800+, overclocked to 3200+, idled around 36c and
only got to app 42c under load. I have also noticed even at idle, the temp
can vary 3-5 degrees C very quickly, which I find unusual.

I am concerned about these temps. I am not overclocking the system yet,
running all at stock ( 11x200). My case cooling is good, I have it in a
Lian Li pc-75 full tower case, which came equipped with 2 cooling fans in
front, and two in back. At this time, I do not have Cool N Quite enabled.
My cpu fan is turning at 3800 rpm.

Any suggestions would be appreciated.

Thanks,


--
Don Burnette

"When you decide something is impossible to do, try to stay out of the way
of the man that's doing it."