The 760 has a boost clock of 1150MHz Mhz which is on par with the 1100 Mhz of the 7870.
Both cards are 256 bit memory bandwidth DDR5.
both are 28nm manufactured.
However, the 760 will perform slightly better than the 7870 in games, like BF3 for example.
Checkout the review and bench's: http://www.bit-tech.net/hardware/2013/06/25/nvidia-gefo...
How can you not play with the 570? A radeon hd5470 can play it at playable frame rates...
Also get her a 760
I am just assuming since it's more demanding. The 760 is nice but the radeon looks to have a bit more numbers on it
I suspect bf4 is going to use more vram than bf3 as well as a stronger card if they really do up the graphics more. I know my 7970 does great on bf3 so id recommend that or a 7950. its better to get a better card and be happy than get a decent card and not get what you expected.