Synology ECC RAM Module Kit, 2x 4GB (RAMEC1600DDR3-4GBX2) DDR3-1600 unbuffered ECC DIMM CL=11 Single Rank 240pin 1.5V Applied to Synology DiskStation model: DS3615xs Applied to Synology RackStation models: RS18016xs+, RC18015xs+, RS3614xs+, RS3614xs/RS3614RPxs, RS10613xs+, RS3413xs+ Also known as Synology RAM Module RAMEC1600DDR3-4GBX2 For expanding your Synology NAS server's memory capacity