The Lenovo ThinkSystem SR250 is a single-processor rack server that integrates power, reliability, flexibility, and security in a compact 1U form factor suited for the small-to-medium business. The SR250 boasts a high price-performance ratio with a combination of high-processing capability and dependability with next-generation Intel Xeon processors and support for an array of storage configurations..Dimensions: 1.7"H x 17.1"W x 19.6"D.6-core processor.No optical drive.EN55024, KN32 Class A, EN 61000-3-2, ICES-003, RoHS, BIS, CISPR 32 Class A, TR CU 004/2011, CECP, UL 62368-1, CNS 13438 Class A, VCCI Class A, EN 61000-3-3, CB, EN 60950-1, IEC 62368-1, EN 50581, NOM-019, GB 9254 Class A, GB 17625.1, IEC 60950-1, TR CU 020/2011, CNS 15663, EN 55032 Class A, BSMI, AS/NZS CISPR 32 Class A, CNS 14336-1, CCC, KN35, EK1-ITB2000, EN 62368-1, CELP, NMB-3 Class A, GB 4943.1, TUV GS, FCC CFR47 Part 15 B.Power device: hot-plug power supply.3-year manufacturer limited warranty.Four expansion slots for upgrading your system.Connectivity interfaces: 1 x PCIe 3.0 x8, 1 x PCIe 3.0 x8, 1 x PCIe 3.0 x4 (for internal storage controller), 1 x M.2 Card.Rack mount server