|As phil22 comments - more specific info is useful..|
Meanwhile rather than just hunting around... a better way to determine what is good - even best.. - for your computer is let something like crucial.com scan the system.
It will download a wee app (quite safe and free); scan the system and advise you what it has found installed re' memory and hard drive. Then will list all compatible upgrades.
Note what it suggests; then go perhaps to Amazon and check what the exact same items cost there. Sometimes they're a little cheaper there - even crucial kit itself...
Don't invest in cheap memory; invariably you get what you pay for and cheap RAM isn't always up to the mark. Stick with a decent brands from a decent/well know source; and crucial is one of those. (I don't work for them just have found their products top notch.)