Storage expansion for QNAP TS-x59 Pro II

I have two of these memory modules as an alternative for the approximately 100-euro "QNAP 2GB RAM DDR3-1333 (CL9) 204-pin SO-DIMM (256Mx64 bits) for TS-459 Pro II TS-559 Pro II TS-659 Pro II "bought. The Series QNAP TS-x59 Pro II offer two RAM slots. One of these slots is busy by a 1GB memory module at delivery, and further provided for memory expansions, is unequipped. At both slots to get easily by loosening the three Phillips screws on the rear panel. The lid is removed and you are the two slots to see. This memory module is in the device QNAP TS-659 Pro II compatible with QNAP memory module. I have replaced the existing 1GB module with this module purchased Kingston and another set on the second slot. Thus, the NAS now has 4GB (2x2 GB Kingston memory), which the QNAP can be completely addressed by the 64-bit operating system. Both modules work without problems, I would buy them again for this purpose.