Quote Originally Posted by Chorizotarian',index.php?page=Thread&postID=46155# post46155]I have similar problems. Vista x64 with SP1. Some of my experiences here:
[url='http://www.dual-boxing.com/forums/index.php?page=Thread&threadID=4749
Adding 3rd video card = *worse* performance? [/url]

I see framerate drops and choppiness when running clone WoW windows on my 2nd or 3rd monitor if and only if that monitor is on a secondary graphics card. If I run extra copies on my main GPU they don't slow me down.

My system:
- EVGA 680i mobo
- Q6600
- 4 GB RAM
- 2x EVGA 8800 GTX
- Main monitor = 2560x1600
- 2x secondary monitors = 1200x1920 (portrait)

Should be plenty of beef for running 5x copies of WoW. At present I can only get smooth framerates by running 2 clones (800x600) on my primary monitor along with my main (1600x1200). I'd really love to find a solution for this so I can go back to running my main in full 2560x1600 glory.
Hmmm, I'm using an EVGA 780i board + 2 EVGA 8800GTS (G92 cores) and SP1.

I think later today I'm going to copy everything off to another drive, format and re-install Vista and re-install WoW and see what happens. I'll let you know tonight if running without SP1 makes any difference.