Lenovo ThinkSystem ST50 One Intel® Xeon processor E-2100 Series Up to 3.8 GHz with 4 cores, Up to 6 cores at 3.5GHz| Up to 4 DIMM sockets up to 64GB with UDIMM and Up to 2666Mhz DDR4 memory speed|ECC| Intel C246 chipset| HDD up to 4x 3.5" non-hot swap| Onboard 6 Gb SATA controller standard support AHCI mode (non-Raid) or Intel RSTe software RAID (RAID 0,1,10,5) | Ports: four USB 3.1 G1, two USB 2.0, one RJ-45 GbE, two DisplayPort video ports, one Serial port | Upto three PCIe 3.0 slots| Half High SATA DVD-ROM or DVD-RW Optical Disk Drive | Graphics controller Intel Graphics Technology (Intel GT) on most processors | Power Supply: 250W 80+ certified or 400W 80+ certified, not hot-swap, not redundant |Tower or 4U rack| Warranty 3 years 9x5 Next Business Day| Standard without Keyboard + Mouse