HP 653955-001 300GB SAS 10K RPM 2.5" SC 6G Hot-Plug Hard Drive for G8 / G9 Power Supply It is the factory-original backplane

It is the factory-original backplane supporting up to eight 2

5-inch SAS 2 (6Gbps) enterprise hard drive at 10

Model: Intel X520-T2

providing the thermal cooling assembly for processor socket cooling in x3550 M4 server builds

Drive Type: MDL (Midline)

HP 653955-001 300GB SAS 10K RPM 2.5" SC 6G Hot-Plug Hard Drive for G8 / G9 Power Supply It is the factory-original backplaneThe HP 653955 001 is a 300GB 10,000RPM 6Gb s SAS 2. 5 inch SC hot plug enterprise hard drive for HP ProLiant Gen8 and Gen9 servers and storage arrays. It provides 300GB of SAS 10K hot plug capacity in a 2. 5 inch SFF form factor compatible with HP ProLiant BL DL ML SL XL Gen8 and Gen9 series and HP D3700, D2220sb, StoreEasy 1830, and StoreEasy 1840 storage. Part Number: 653955 001 Capacity: 300GB Interface: SAS 6Gb s Form Factor: 2. 5" SFF hot plug