Rails includedDual Power2 heatsinks includedBarebones Chassis only no Memory no CPUCan fit up to (front) 12 x 3.5" HDD/SSD's & (rear) 2 x 2.5" HDD/SSDSystemboard Specifications:Dual Socket comptiable with Intel® Xeon® processor E5-2600 v3, Intel® Xeon® processor E5-2600 v4.Up to 2TB ECC 3DS LRDIMM , up to 1TB DDR4- 2400†MHz ; 16x DIMM slots1 PCI-E 3.0 x16, 6 PCI-E 3.0 x8 slotsIntel® X540 Dual port 10GBase-T10 SATA3 (6Gbps) ports w/ Intel C612 controller; RAID 0, 1, 5, 10Integrated IPMI 2.0 and KVM with Dedicated LAN5 USB 3.0 and 4 USB 2.0 ports