Is this ram compatible ?

[Agzastrgath]

Hello good people
I have an asus s551lb
it supports 12 gigs of ram and i only have 8 installed
it has 4 gigs soldered to the mother board and another 4 gigs stick
so am gonna replace the stick with an 8
I already done some of my home work and I know for sure that the ram is upgradable
so this is the ram i currently have in my laptop :

and this is the ram i wanna replace it with :
CRUCIAL CT102464BF160B Sodimm DDR3 Arbeitsspeicher 8 GB

http://www.mediamarkt.de/de/product/_crucial-ct102464bf160b-sodimm-ddr3-1804232.html

if not is this one compatible ?
PNY PC3-12800 Notebook SODIMM Arbeitsspeicher 8 GB

which is compatible and if all are
which one is the best ?

thanks for ur time
and am being really dummy here cuz am ordering across the seas :S and if i order the wrong one
there ain't no refunds or returns plus no way i can get another one

Thanks!

 

[Dark Lord of Tech]

http://www.crucial.com/usa/en/systemscanner
Run the scanner.