I believe that you integrated chip IS the problem. The integrated Intel chip that you are using actually is using your system memory for the game. This is also leaving your system less RAM for itself. The Intel chip would be the equivelant of a 512 dedicated GC. The reason it performs well for awhile is because it is using you PC's RAM, after playing for a bit you are literally running out of RAM and play starts to degrade then crash.
Get a dedicated GC and you'll see a difference. At least a 1 Gb card.
You shouldn't need the command line after that
Last edited by Cosmic Joker; 08-24-2013 at 04:01 AM.. Reason: auto-merged double post