I got 15 or so boards sitting here to review. Will be doing these board reviews until September 1st, about 1 a week or so. Haswell is IVB + SB-E tweaking. iVR allows tighter regulation, so droop...pretty much gone now. Also, L3 cache is now separate from CPU speed(was linked before), so if you got cache that runs a bit poopy, it doesn't hold the CPU back. Also, since cache utilization is never 100%, this allows you to run cache speed lower, and thereby lower temps. Really, it's everything you want as an OC'er. The level of tweakability is amazing. At the same time, it's still simple, but one more voltage is required for most 24/7 use, the ring voltage, since that's L3 and ring-bus. Since workload in cache increases with CPU speed, you need to increase ring voltage as well. There are about 20 other voltages now to play with for those wanting to really push limits. 3100 with Hynic MFR PBC-based DIMMs is a piece of cake with most CPUs, but bandwidth is low. Nearly every CPU should do 2800 MHz high-bandwidth. That said, I run 4.6 GHz, but only 3.9 GHz cache. If you look at the results in this review, there is IVB, SB-E, and Haswell results there. Even with the slower cache speed, Haswell still beats IVB in nearly everything. ES chips are different than retail. There are several versions of ES, not sure who exactly has what. I really hate reviews with ES chips, since that's not what end users get. This isn't the fault of the reviewers that used them...Intel should have given them retail for review. I seen advice to stay with 1.5V XMP DIMMs if possible for 24/7 use. 1.65V is absolute max instead of the 1.85V of IVB. Dunno how that relates, but I find DIMMS that hated voltage before now scale really really well, not sure if that's the chip, the platform, or my tweaking...still testing.