I understand the concern from the 680i buyers, I bought one because of the bios options and not the fact that I could go SLI, I buy and sell my graphics cards and rarely lose money on them, The 680i boards were being touted by the enthusiast sites and nvidia as upper tier solutions that would be quad core ready when they came out, Sure you could plug in a B1 or a G0 quad into a 680i and with much work get stable at 3.2-3.4 but you have to redo the NB and SB thermal pastes because they come completely screwed, second most people have to pencil mod because V-droop is twice what a p-35 or even a 965 board will give you and the amount of volts you have to use is generally more than you have to use for the same OC on a P35 board. I had 3 bad RMA 680i boards that died within days of recieveing them.
I was stable with a E6600 but the second I went quad everything went downhill. With the IP-35-E that I replaced them with I was able to get 3.6 stable at the same voltage that I needed to get 3.0-3.2 on all of my evga 680i boards. I know that the P35 is much newer chipset and has had the benefit of greater lead time and engineering support from Intel. What juices most of us is that we payed 250+ bucks for a motherboard that was labeled as an "Enthusiast" board-it said so on the box lol-
Buyers remorse is what this is all about honestly-