I tried updating my 9800gtx to the latest drivers (the beta ones since i already had the latest standard ones) and found no difference, I still couldn't run two clients without the effects screwing up (even in the background of the loading screen).

Next I tried running my WoW in opengl, that fixed it enough that I can now run two copies but now it gets small freezes in the client eg. one of the WoW clients will freeze for a second but the other will continue fine, what is strange though is that it seems to have nothing to do with settings/fps, I can hav 70fps on each client and it will still do it.

I also noticed that when running two clients my 1st and 2nd cpu and both maxed at 100% usage each (even on lowest graphics settings) and that 3rd and 4th aren't used at all.

If I try and run three WoW clients normally or in opengl it still lags out way to much to even be playable (on lowest graphics settings), even though with the 8800gt and 2gb of 800 ram I didn't have any problem running three.

For the person asking about my ram and OS I'll post the rest of my comp specs incase that can help:
ASUS P5K Pro
Intel Q9300 Core 2 Quad 2.5Ghz
Windows XP sp2

but they never changed, the only thing that changed were:
8800gt ==> 9800gtx
2gb 800 ram ==> 2gb 1066 kingston ram