SNIP: This motherboard supports the latest Intel® Core i7 processors in LGA1366 package with integrated memory controller to support 3-channel (6 DIMMs) DDR3 memory. Supports Intel® QuickPath Interconnect (QPI) with a system bus of up to 6.4 GT/s and a max bandwidth of up to 25.6 GB/s. Intel® Core i7 processor is one of the most powerful and energy efficient CPUs in the world.

As the big brother to the P55, the LGA1366 socket X58 chipset has been lagging behind in terms of new features that have been implemented in the other chipsets, specifically USB 3.0 and SATA III 6Gb/s. As a result, ASUS has released the P6X58D-E, featuring USB 3.0 and SATA 6G, hence the -E