Brand New Sealed Unit * ---SK Hynix HMT451U6BFR8A-PB Memory Module ---Form Factor - UDIMM ---Capacity - 4GB ---Bus Speed - PC3-12800 (DDR3-1600) ---Pins - 240-Pin ---Error Correction - Non-ECC, Unbuffered ---Cas - CL11 ---Memory Clock - 200Mhz ---Rank - Rank 1 ---Voltage - 1 .35V.