Synology - DDR3 - kit - 4 GB: 2 x 2 GB - DIMM 240-pin - 1600 MHz / PC3-12800 - CL11 - unbuffered - ECC - for Disk Station DS3615xs; RackStation RS3614RPxs, RS3614XS, RS3617xs

Up to 1600 MHz speed with Unbuffered signal and CL11 latency for smooth computer performance DIMM 4 GB memory allows you to have more programs open at a time DDR3 SDRAM operates at an effective bus speed with minimal power consumption and as a result, you get optimal computer performance with an improved memory heat dissipation