Quote Originally Posted by 'BobGnarly',index.php?page=Thread&postID=131633#po st131633
Windows XP?
It doesn't handle D3D apps across multiple monitors well at all. Vista is much better.
If you don't care about the non-native res on your 24", you can set it to horizontal span which will help a lot. I, personally, couldn't stand it.
This.

You could try Span but as BobGnarly says, you'd have to drop your 24" monitor down to 1680x1050. I also tried Span on a very similar specced PC to yours and it was still pretty crap.

Then I switched to Vista 64 and everything is now fine running five WoW instances on two 1920x1200 screens.