Qnap RAM-4GDR3-LD-160 Module Memory, Memory Amount 4 GB Capacity, Speed 1600 MHz, Memory Type DDR3 SDRAM, Compatability TS-870U-RP, 879U-RP, 1270U-RP, 1279U-RP, 1679U-RP. The QNAP RAM-4GDR3-LD-160 is a module memory with a 4GB memory amount and specially designed for Qnap TS-870U-RP, 879U-RP, 1679U-RP, 1279U-RP.