My son (Eight years old) is wanting to use his allowance to upgrade his graphics card. He has $20. I have told him that i would cover taxes and shipping but are looking for something that is better than what is currently in it. Here is his pc. I have put 3 gigs ram with a 2.9 dual core cpu. It does have a limit to long cards. I have a spare Geforce GTX 260 but it wont fit because of the length. He doesn't really worry about what the graphics look like rather than the ability to play things functionally. Any assistance would be very much appreciated.