HP Microserver Gen8 RAM?

Hi all, 

i've bought a Microserver Gen8 used, and want to upgrade the RAM. Right now there is only 4GB RAM inside. 

On the RAM stands; "4GB 1Rx8 PC3L - 12800E - 11 - 13 - D1" and  "HMT451U7BFR8A - PB TO AB 1532" 

So if I want to upgrade to 8 or 16 GB what should i search for? And can i use "normal" RAM or? 

My product number of the server is : 819185-421   can't find anything about which version/name this is. 

Thank you!