The SR3 is a dual socket LGA2011 2P enthusiast desktop/workstation motherboard in the E-ATX form factor. Socket 0 is wired to eight DDR3 DIMM slots (two DIMMs/channel), while socket 1 to four slots (1 DIMM/channel).
In LGA2011 2P systems, the processor sitting on socket 0 is wired to the PCH (SR3 looks to have Patsburg-T), while the processor on socket 1 is wired to the one on socket 0 using two QPI links, closing the daisy-chain. Socket 0, apart from its 4 GB/s DMI link, has a PCI-Express 2.0 x4 (another 4 GB/s) link to supplement the DMI link, so the storage controllers don't get bottlenecked with just DMI. Both processors contribute to the PCI-Express lane budget of the motherboard. There are seven PCI-Express x16 slots, among which four are PCI-Express 3.0 x16 capable, every slot is PCI-Express 3.0 x8 capable. NVIDIA 4-way SLI is supported. This board will support Sandy Bridge-EP Xeon processors, though we don't know at this juncture if Core i7 Sandy Bridge-E is 2P capable.