Tom's did an evaluation on gaming performance on this very subject:http://www.tomshardware.com/reviews/Intel-Core-i7-Nehalem,2057-13.html
Basically, only a few percent difference.
ok so heres the thing, my motherboard only has the last two slots working for ram as opposed too having all six slots working wich would be tripple channle? in cpu-id it says single channle and i believe it because the last two out of six mem slots are the only ones working. it has broke over the years and now when you can find um there usualy like 150 to replace the motherboard and thats to much for me i broke my back so have little income therefore im workin with what i got.
the boards is a gigabyte EX58-DS4 motherboard and basicly im wondering how much speed im loosing by not replacing the board? is there any charts out there or anything or like how many fps in a video game am i looseing? is this a big impact? by not atleast having dual channle yet only having single channle