http://www.supermicro.com.tw/products/motherboard/Xeon/C600/X9DRW-3F.cfm

1. Dual socket R (LGA 2011) supports
    Intel® Xeon® processor E5-2600 
    and E5-2600 v2 family^†2. Intel® C606 chipset; QPI up to 8.0GT/s3. Up to 1TB ECC DDR3, up to 1866MHz;
    16x DIMM slots4. Riser card support:
    Left side - 1 (x32) PCI-E 3.0
    Right side - 1 (x16) PCI-E 3.05. Intel® i350 Dual port GbE LAN6. 4x SATA2 and 2x SATA3 ports7. 8x SAS ports from C6068. Integrated IPMI 2.0 and KVM with
    Dedicated LAN9. 6x USB 2.0 ports 
    (4 rear and 2 via header)