At the time of writing this review, this was the EXACT board/track/chip memory that was in my Synology. By default, DS1618 comes with 1 4GB module and 1 open slot. I added this to bring my NAS to 8GB. Before purchasing, I visually inspected the Synology RAM in my device. The only difference is that Synology's circuit board is green while this one is black. Again, board layout and CL rating are identical. I've seen other RAM update reports where the Synology Console log contains "Warning messages" that Synology "authentic/genuine" RAM is not being used. (What the heck of Synology - RAM is RAM). This store was NOT throwing "Authentic/Genuine" errors like some others. However, check your device's RAM visually. YMMV.
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