Opened up the NAS I just bought, made in 2013, and here is a picture of the RAM.
I found a pair of simms exactly the same, and it has two empty of the 4 slots, but if it would work with 8Gb simms, I'd rather max out all 4 slots, but I don't know if there are different types of ECC or speed issues, including CL9 in ebay searches does bump up the price etc. I am willing to gamble on 4 vs 8 Gb, but not if I have to worry about ECC or step issues.
I found a pair of simms exactly the same, and it has two empty of the 4 slots, but if it would work with 8Gb simms, I'd rather max out all 4 slots, but I don't know if there are different types of ECC or speed issues, including CL9 in ebay searches does bump up the price etc. I am willing to gamble on 4 vs 8 Gb, but not if I have to worry about ECC or step issues.