The 5770 would be the better card with a qualification. Mainly that it's a Directx 11 card and has had no driver support in a long time. It's in AMD's legacy section. The GT 730, and it should be the DDR5 version only you consider, is more 'current' if that's important to you. You might also need a 6 pin connector for the 5770. The amount of memory is meaningless with cards like this, 4gb of DDR3 isn't going to help.