xXCrossfireXx :
Forever Oleg :
Sorry, I thought he was gonna upgrade the power supply as well.
But if he has only a single 6-pin then this is probably his best option: http://pcpartpicker.com/part/evga-video-card-04gp41962kr
Thanks, I'll ask him. I saw in another answer though that the card itself will bottleneck 4 GB, making it useless on the card, so only 2 gigs is useful. Is this correct? Also if it helps, my friend is aiming towards high settings, not ultra
Yes, that is mostly correct. Only in games like the latest Assassin's Creeds and a couple others, the 4GB actually helps but yes, in most games, 4GB over 2GB (only in GTX 960's case due to its 128-bit bus), the 4GB GTX 960 is almost useless.
The difference in price is marginal so if you can, go with the 4GB one.