I'm really surprised you still had the proble  with a GT560 Ti, Bruno - I thought that was supposed to be a real top-of-the line NVIDIA card!  I was doing some research and found that my 2-yr old system only has a 460 Watt power supply so the GTX 550 card is about as high as I  can go.  I have a feeling I wouldn't see too much improvement though so I hesitate to spend the $185 +-.  I even checked into a new "custom built" HP, but at some $2,500, you don't get more than 10GB RAM and a GTX 550 card.  And here I thought computer prices were coming down!  Ha!!