I upgraded my hardware a little with a new graphics card the gforce8600 GTS. It was not the best but in theory a card I could live with and not lose an entire finacial leg completely by purchasing it.
Some games like Medal Of Honour, Battlefield 2142, Stalker run fine on this card. Not perfect on maxed out settings but playable and more then I was used too anyway. But it turned out games like e.g. World In Conflict, Code of Honor The French Foreign Legion cause black screens with this graphics card. That means after playing about 5 or 30 minutes the screen goes black. The sounds after that will hang and you have a system crash that won't end. Pretty bad considering both products are recently produced.
I thought I partly solved the problem by reinstalling the drivers of the graphics card and replace it with "ForceWare Release 163 WHQL Certified" via:
http://www.nvidia.com/Download/index.aspx?lang=en-us
Rumors where heard about a patch for World In Conflict being released next week. I truly hope they will solve the black screen problem with that patch. Because the black screens are still there with me and the Asus EN8600 GTS.