at this website (https://www.myfixguide.com/manual/asus-vivobook-s550cm-disassembly/ ), and the spec page of the the mentioned laptop (https://www.asus.com/Laptops/ASUS_VivoBook_S550CA/specifications/ ) it has 3gb cache. what is ssd cache? and can i put a regular ssd (mini pcie) in there?