So I have a dell optioned 755 and a core 2 Duo and a Radeon hd6450 that just isn't cutting it. I need a cheap card that can max league at 720p and possibly play battlefield 4 on low. I have the biggest optiplex 755 there is. I wanted the msi gt 740 but it was dual slot and I just can't see that working cause my slots farthest left.any help helps thx