Upgrade to a xfx 6670for 85 bucks http://www.newegg.com/Product/Product.aspx?Item=N82E16814150587
and you'll be able to play on high resolution at 1920x1080 with 27-39 fps(perfect for low cost/power gaming)
Trust me I've read all the D3 benchmarks ect. This way it's more enjoyable for you, and you don't lag if we meet 😛