I recently got a upgraded my comp:
9800gtx
2 x 1gb kingston 1066 ddr2 ram

from:
8800gt
1 x 2gb 800 ram (not sure which brand)

I had just started multi-boxing before I upgraded (just got to level 6 on 3 chars), but after I upgraded my clients started screwing up if I try run more than 1.
If i run 2 clients the effects in the background of the loading screen mess up, and if I run three my whole computer lags out and becomes completely unusable.

Im realy sorry if this has already been posted somewhere but i have just spent the last few hours tring to find information on how to fix it and I can't find anything.

Thanks for any help =)