This product is either discontinued or we cannot get that from suppliers.
Qnap 600 8GB Ddr3 Ecc Ram 1600mhz Long-Dimm RAM-8GDR3EC-LD-1, DDR3-1600 long DIMM RAM, 8 GB, 1600 MHz, ECC.
The 8GB DDR3-1600MHz ECC Long-DIMM RAM Module from Qnap is designed for use with TS-EC879U-RP, TS-EC1279U-RP, TS-EC1679U-RP, TS-EC1279U-SAS-RP, TS-EC1679U-SAS-RP, SS-EC2479U-SAS-RP.