ASUS Rampage IV Extreme Cometh
The LGA2011 socket is wired to eight DDR3 DIMM slots (two per channel). CPU and memory VRM areas are located along three sides of the socket, all cooled by heatsinks that are connected by heat pipes. These VRM heatsinks share heat with the one over the X79 PCH, which is actively cooled by a fan.
Expansion slots include four PCI-Express 3.0 x16 (red), of which two are x16-capable, and all are x8 capable, one PCI-Express 2.0 x4 (black, wired to the PCH), and an x1 slot. Storage connectivity includes four each of SATA 6 Gb/s (red) and SATA 3 Gb/s (black), and one eSATA, and a power-eSATA (unknown datarate). There are eight USB 3.0 ports (four each on the rear panel and front-panel headers). Surprisingly, there's only one gigabit Ethernet connection, the other connectivity option is Bluetooth, which plays a key role in some of the ROG-exclusive features such as ROG Connect. For once, ASUS did away with the Creative X-Fi soft-layer for its audio and the solution is pure Realtek ALC898 8+2 channel HDA codec (with Realtek driver).
Where do I even start with the toys overclockers get with this board? OK, first, the LGA2011 socket is designed in such a way that its Intel-spec retention bracket can be replaced by a custom ASUS-designed one, that modifies the cooler mount holes to make the socket compatible with LGA1366-ready coolers, so you can carry on with your expensive LGA1366-ready water-block. Second, there is a strong VRM that's backed by diagnostic phase and temperature LEDs, voltage direct-measurement points, and a EPU chip that marshals the power phases. There is redundant BIOS (in separate socketed serial EEPROM chips), with ASUS ROG-exclusive UEFI firmware. Thirdly, power is drawn, apart from the 24-pin ATX and 8-pin EPS, by a 4-pin ATX (CPU power) and a 6-pin PCIe, so electrical stability is maintained. The ROG connect feature lets you monitor and overclock your board from Bluetooth-enabled smartphones (hence the Bluetooth controller).
To top it off, every Rampage IV Extreme packs a free copy of Battlefield 3 Special Edition (bundles Physical Warfare and/or Return to Karkhand DLC(s)).