I am on a $100 budget to upgrade my computer to be able to play games like Arma II or other games on Medium settings. The current computer I have is This HP pavillion http://www.newegg.com/Product/Product.aspx?Item=N82E16883203771 I was thinking about a graphics card like the AMD Radeon 6670 which seems to be highly recommended but the 7750 seems to be about on my mark also. My main question though would be to know if my power supply could handle these.