HP 8GB 240-Pin DDR3 SDRAM ECC Registered DDR3 1600 (PC3 12800) System Specific Memory Model 647899-B21 Compatible System: Designed For: HPE ProLiant SL250s Gen8 Base 2U Left Tray Server, SL250s Gen8 Base 2U Right Tray Server Cas Latency: 11 Rank: 1Rx4