HS2577L,19" 2U rack Barebone, 550 watts 2U power supply ,

1. Single socket H2 (LGA 1155) supports, Intel® Xeon® E3-1200 v2 series, Core i7/i5/i3 (non-ECC UDIMMs only), Pentium® & Celeron® processors
2. Intel® C216 Express PCH chipset, Up to 32GB DDR3 ECC 1600/1333MHz, ECC/non-ECC UDIMMs in 4 sockets
3. Expansion slots: 1 PCI-32 bit, 2 (x4) PCI-E 2.0, 2 (x1) PCI-E 2.0,
   and 1 (x16) PCI-E 3.0
4. Intel® 82574L + 82579LM GbE LAN , 2 SATA3 (6Gbps), 4 SATA2 (3Gbps) , 1 VGA, 2 HDMI, & 7.1 HD Audio ports
5. 8 USB 2.0 ports (4 rear, 4 via header), & 4 USB 3.0 ports (2 rear, 2 via header), vPro 8.0, AMT 8.0 support

HS2577L,19" 2U Barebone, 500 watts 2U red. p/s ,

1. Dual socket R (LGA 2011) supports, Intel® Xeon® processor E5-2600,  Intel® C602 chipset; QPI up to 8.0GT/s, Up to 512GB DDR3 1600MHz ECC, Registered DIMM; 16x DIMM sockets
2. Expansion slots: 3x PCI-E 3.0 x16 and 3x PCI-E 3.0 x8, Intel® i350 Dual port GbE LAN, 8x SATA2 and 2x SATA3 ports
3. Integrated IPMI 2.0 and KVM with Dedicated LAN, 11x USB 2.0 ports, (4 rear, 6 via header + 1 Type A)

1. Single socket R (LGA 2011) supports ,   Intel® Xeon® processor E5-2600/1600
2. Intel® C602 chipset; QPI up to 8.0GT/s, Up to 256GB RDIMM or 64GB UDIMM;   DDR3 up to 1600MHz
3. Expansion slots: 2 PCI-E 3.0 x8, 2 PCI-E 3.0 x8 (in x16), 2 PCI-E 3.0 x4 (in x8), 1 PCI-E 2.0 x4 (in x8)
4. Intel® 82574L Dual port GbE LAN
5. 2 SATA3 (6Gbps), 4 SATA2 (3Gbps),  & 4 SATA2 (3Gbps) ports via SCU
6. Integrated IPMI 2.0 and KVM with Dedicated LAN
7. 9 USB 2.0 ports (2 rear + 6 via header + 1 Type A)