Okay, so just to get some information out of the way. I have a Nvidia GTX 560TI graphics card that does work with El Capitan but some animations aren't well... smooth. Such as resizing windows, double clicking a window to maximize it. They are all fairly choppy. Other than that it works fine. I got the idea to maybe try the Intel HD 3000 IGP in my i5 2500k to see if maybe i wouldn't get some better performance as far as animations are concerned. Well so far no luck. The performance is...
Intel HD3000 artifacts/performance OS El Capitan
Intel HD3000 artifacts/performance OS El Capitan