So I am looking to upgrade a bit with my Laptop's RAM, I currently have one 8 GB stick. I can't afford to upgrade to 16GBs so i'm just gong to get a 4GB stick to go with the 8GB stick. The problem is i'm not sure what kind to get. I tried every memory scan tool out there and none of them were able to tell me what kind of memory I have. I did open up the laptop and it says on the RAM Samsung 8GB 1Rx8 PC4-2400T-SA1-11. So I am assuming I should get a stick of 4GB PC4-2400T RAM, is that right, I'm not sure what the 1Rx8 or the SA11-11 is about, I've never seen that. I usually get everything off Amazon but the only thing that cane up when I searched for 4GB PC4-2400T was this https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias=aps&field-keywords=4GB+PC4-2400T is that Crucial one the right one, does anyone know where I can get it cheaper.