Intel C621 , S3647 , CPU's Xeon , Maximum number of CPUs 2 , ATX , 1xPCI-Express 3.0 4x , 3xPCI-Express 3.0 8x , 2xPCI-Express 3.0 16x , DDR4 , 2666/2400/2133 MHz , Memory features RDIMM/LRDIMM/ECC , 1x15pin D-sub , 2xUSB 2.0 , 2xUSB 3.0 , 2xRJ45 , 1xCOM via Header , SATA , USB 2.0 , USB 3.0 , SATA 3.0 , LAN Gigabit , RAID SATA 0, 1, 5, 10