So I returned the server and bought a new pc, as mentioned, I only got the low-tech zotak to work. But that got a quite good graphics. Not good enough for me, tho. Thanks for all the help!
Hello all  I got a Dell PowerEdge 840 Server for free and want to use it as a normal pc at home. Is that possible first? It has Windows 7 installed and works fine, only the graphic card is really bad for videos and so on. Lags in full screen and games doesnt work at all. I bought a new one with a normal PCI slot (I think the PowerEdge doesnt have a PCI-e)  [URL]  I inserted it in one of the free slots and plugged it in. I still have an Image via VGA but the graphical performance didnt increase. I checked the device manager and it says there is a failure at the PCI-PCI bridge. First it says device not working. I delete it and reinstall it and it says Code 12, device has no resources. Please help, I got no Idea, what to do now :(  Cheers!
Graphic Card not working in Dell Power Edge 840 Server