I'm pretty sure there is a big difference between the 750i and the evga 750i FTW...If thats what you mean.
I tried... not very hard.
680i SE mods? - XtremeSystems Forums
I looked up some stuff on google too.
It seems the problem is in the FSB limitations on quads, and most mods out there that i know of (pencil mod for example) are more for controlling the voltages better.
680i pencil mod - Overclock.net - Overclocking.net
I've posted on a few forums but still can't find a mod worth trying. So I'll just keep it as it is.