Samsung Original 2GB DDR3 1333 256Mx64 CL9 Desktop Memory Model M378B5773DH0-CH9 (Certified Refurbished) Dell OptiPlex 390 Desktop DDR3 RAM Memory Memory Type: DDR3 SDRAM Data Transfer Rate: 1333Mhz Capacity: 2GB Samsung Model: M378B5773DH0-CH9