If you're willing to go up to 300$ then get the HD Radeon 7950.http://www.newegg.com/Product/Product.aspx?Item=N82E16814202026
. 309.99$. Not sure if voltage unlocked, wait for confirmation.
And a cheaper 7950 : http://www.newegg.com/Product/Product.aspx?Item=N82E16814161420
. 279.99$. Not sure if voltage unlocked either so wait for confirmation.
Comes with free Bioshock and Crysis 3 codes. Yes the 7950 will run on your 500W with no problems but if you're gonna Crossfire then you'll need a bigger PSU. ( EDIT : After reading your second PCIE slot is 2.0 @x4 which I don't think will be worth it when crossfiring ).
If you need it around 250$ and can't go much higher, the HD Radeon 7870 Tahiti LE ( XT ) seems to be the best choice in that range. http://www.newegg.com/Product/Product.aspx?Item=N82E16814131484
I have no idea if its cooling is sufficient or if it's voltage unlocked. All other 7870's Tahiti LE's are out of stock at newegg unless I'm missing something.
What resolution do you game on?Edited by Skorpian - 4/5/13 at 2:33pm