Intel Core i7 5820K @ 4.2GHz | Asus X99 Deluxe Motherboard | 16GB Crucial DDR4 2133 | MSI GTX 980 4G GAMING | Corsair HX750 Gold | 500GB Samsung 840 EVO
Another reason why people recommend the i5 over an i7 is because of the extra price you have to pay for the i7 which yields no performance increase for most users.
---------- Post added 2011-02-27 at 12:14 PM ----------
Hyperthreading does work on some games, but it usually yields no performance difference versus no hyper threading.
Hyper threading uses virtual cores to split up the workload. You can find more information on google or wiki.
[23:43:22] [P] [85:Bowsjob]: If its between 2 holy pallys its gonna be a gear fight most likely