I have a 745 but there's 4 different models as far as I know, and I have the 2nd to largest one that looks exactly like this http://www.rakuten.com/prod/refurbished-dell-optiplex-745-intel-core-2-duo-1800-mhz-80gig-hdd/228632804.html?listingId=204056285 . So i wouldn't be able to install a normal-sized graphics card horizontally since my tower wouldn't be wide enough to shut. I was hoping for a high performance card under $100 but if that's not possible i'll go with lower performance/