Im planning on upgrading my asus ram http://www.asus.com/Notebooks_Ultrabooks/ASUS_VivoBook_S500CA/ and im afraid to buy the wrong kind of ram and my laptop wont work after that. I was planning on buying the CORSAIR Memory Notebook 4GB DDR3 PC-12800 Is this ram compatible with my laptop Ram Slot? and can anyone tell me whats the max ram capacity of my laptop? And one more thing, should i change my current ram? its a ELPIDA 4GB DDR3 PC3-12800S. Thanks in advance.