At the mo there is 1 of 2 ways with the cards you have... 1) purchase a Matrox tripple head 2 go, although does have resolution limitations (1680x1050 per screen max I beleive). 2) download and try out SoftTH (requireds that 2nd gfx card must be pci-e), then head over to WSGF and check out the games list where by it will tell you what games will run, how well they run, and how to get them to work with multi screens. As for the 8600GT, only thing ic an think of is that its perhaps not gaining enough power from the mobo, im assuming it does not require power from the PSU?? The latest nvidia chipset certainly supports both cards. I used to have a 8800gtx + 8400gs which ran fine.