Am not sure how i managed so far with just 8GB of ram on my lenovo tiny M93P system , these days i constantly see the msg out of memory in my browser.
both sticks should be of the same brand and speed. Not looking to spend much as the system itself is old and showing its age for anything other than browsing and some light work.
I have one 4gb one lying around in case you are not able to find a 8gb one.
Edit- looks like DDR3 sodimms are available for so cheap on amazon. why dont you take it from there ?
the cheapest reliable brand Hynix is selling each 8GB stick for 1370 which makes it 2470rs for 16gb , doesn’t seem very cheap for me especially for an old system
Dont think you will get anything good for really cheap,dd3 might be old but it has also been out of production for a while,your best bet would be to try in local repair shops,they might be able to source something for you