The 4820K should overclock better because the IHS is soldered on, while the 4770k uses TIM, so if you like running high OCs (or low temps), that's another reason to get the Ivy-E and one of the newer X79 boards (which have added chips for more SATA 6 GB/s and USB 3.0 ports, the latest audio chipsets, etc.). 40 PCIe lanes vs 16, quad channel memory vs dual, and an upgrade path to the world's fastest desktop processor - all good reasons to go for Ivy-E. If you manage to get a motherboard that works as advertised, you'll be golden, because if at any time in the future you feel the need for more speed or power, you can get a 6-core CPU, add more or faster RAM, and add more video cards, all without the usual bottlenecks you'd expect on the mainstream chipsets. Also, plug-and-play PCIe SSDs are becoming more common and reasonably priced, so those extra lanes will come in handy. If you are building a fairly high-end system, the prices are the same either way.