I just got a pm asking about SB-E vs. Interlagos vs. Magny Cours, and it was a long enough answer that I figure I might as well post it here:
Well, I had a 3930k, and sold it quite quickly. Not a great folding option, and not a great gaming/folding option. I say this because to really get your money's worth, you should be in Linux 24/7, so, not great for gaming. Not great for folding because it will suck up 350w, require nice cooling and still net you < 150k for about $1k.
As for MC vs. IL, I'm still MC (I bought 4 6174s). I'm sure you have read the MC IL debate over at [H], if not, off you go, http://hardforum.com/showthread.php?t=1652213
. However, I'm sure you have, so here is my take on it.
A 6272 will perform about 25 seconds faster than a 6174, that will be about 15k faster. Now, if you were planning on buying your chips retail regardless of price, IL all the way. However, because a 6174 can be had on ebay for ~450 (I just bought 4 [auctions] that averaged out to $450 each), you are saving $400 dollars over IL. That, and it will consume 100+ watts less, MC is the right choice. Even at $525, 15k PPD is not worth the extra watts, if you are paying for it.
Now, if you are not paying for your own electricity, and you don't want to wait for and 6174 auctions to come up, then IL is the way to go.
Having said all of that, there is a fourth option. Right now, I think it is the best option. Buy a 4p board and 4 x 6128s. This will cost about $1300. That is about the cost of a 2p board and two MC or IL chips (maybe slightly more). It will net you 260k PPD, which is far more than the 180ish you can expect form a 2p IL or MC setup. Then, over time, as auctions come up, you can upgrade to MC or IL. And better yet, used IL may start cropping up for < $400.Edited by hoth17 - 12/16/11 at 11:53pm