After running a QNAP TS-459 Pro+ for the last 3 or 4 years at home, my monitoring was alerting me about memory warnings cause I upgraded my SqueezeBox Server to the latest nightly version. So I looked into how to upgrade the shipped Adata SU3S1333B1G9-B.
It seems that the KVR1333D3S8S9/2G should work, so I ordered one. After plugin it in, it revealed that the module wasn't working while it worked for others. After digging around, it seems essentially that the module has a 8-chip design. Indeed, my module just has only 8 memory chips, but the design is a 16 chip. So I thought it would be a nice try to order the one from amazon that worked for others.
And like expected it's not the same module but has the same Kingston Part Number.
As you can see, the 16 chip design module has printed 9905428-189.A00lf on and the 8 chip design 9931712-009.A00G. It's something like in the Wireless LAN USB dongle business where they sell totally different hardware with the same Part Number but different Revisions.
I also ordered a Samsung M471B5773DH0-CH9 cause that's also a 8 chip design.
To make it short, both 8 chips design modules worked like a charm, the M471B5773DH0-CH9 and the KVR1333D3S8S9/2G (9931712-009.A00G). - Please avoid the Adolf one from Kingston! ;)