i'd say the i7 920 with the x58 is more for enthusiasts and overclocking where you can really push your hardware, 870s and their platform are just cheaper
Originally Posted by Conley
860 supports less RAM, the RAM has to be slower, and it's dual channel instead of triple. It also has a 95W TDP vs the i7's 130W. The speed difference doesn't really matter, because if you're getting an i7 you should automatically overclock it.
I'd go with an AMD build for your friend and save some money. He really doesn't need an i7 for Borderlands.