No problem on my AMD 4200+ dual-core.  My guesses for what might cause this on
an upgraded machine that had no previous problems:
 1) heat problems, especially if you changed video cards and your case isn't
    well-cooled.  Try running it with the cover off and see if it happens.  
 2) driver problems, especially if it isn't a fresh WinXP install, and/or if
    you upgraded video card along with chip (and probably mobo).  Check
    drivers for EVERYTHING, especially video and sound.
 3) power problems, if you changed to a greedier chip or gpu and
    didn't upgrade the power supply.  No way I know to diagnose this other
    than trying it with a bigger PS.

I've not heard of any problems on dual-core chips per se.
--
Mark Rafn    dagon@dagon.net    <http://www.dagon.net/>  

that's totally not a dual-core issue, per se - unless the act of replacing
the cpu, as mentioned in mark's post (above), caused physical issues (like
heat)

i second his ideas about drivers / os ...

and out of curiousity, what made you pick the 4400? the 4600 is the top in
that line and the 4200 has the best price:performance ratio ... i'm just
being anal =)

~fennin.faza / firiona.goom~

Google for a freeware program called runfirst.exe.  Put it in your
everquest directory.

Then make a batchfile to start up eq something like the following:

@echo off
cd "c:\Program Files\EverQuest"
c:
.\runfirst.exe everquest.exe

runfirst.exe will force processor affinity for the program it chains to
to the first core of the CPU.  The normal methods to set processor
affinity (through task manager) do not seem to work for EQ.

My girlfriend had the same problem and after i installed an amd dual
core patch, the problems dissapeared, cant remember what the link was
though. Found it in the official forum for Everquest 2.

Found the patch link:
http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html

Good luck with your problem

Frank Lindstrom, webmaster of http://poker.vcfrontline.com