LGA 1156 Socket CPUs instead of i7, Bottleneck most of the Modern games.
So, get a i5 of LGA 1155 Socket.
Good is to get i5 3570k or a 3470.
Or he could just buy a second hand i5 750 or 760 for a fraction of the price. Overclock to near 4Ghz and it won't be a bottleneck.