Have been searching and downloading various apps all afternoon..only to find they are no good for 10.6.8...and I am not going to 10.7..8 or 9..well did install 10.9 Mavericks on a spare drive...but it is so slow on a 2008 Mac Pro that it is not worth it.. ..tried various...xbench..but cant select which graphics card to test...Valley and heaven only work on 10.7 or higher GPUTest..no good either. I bought this Mac in 2009 with the thought that it would last a few years, do an upgrade and keep it a bit longer...At least MS supports it's OS's for a few years. XP ??? 12 years?? ..only stopping support now...Even the latest Pages won't run on 10.6.8 ... MacPro 3,1 twin Quad core 3.0Ghz Xeon 18 Gb RAM so any one know of a good gpu testing app that will run on 10.6.8 that will allow me to swap test and compare graphics cards.