I have 4GB DDR3 SODIMM RAM 1600 installed with a slot for another 4 GB. I would like to know if I install an additional 4 gb RAM will my system run any faster Its pretty slow,even my 7yr old XP PC is faster. Currently installed is a samsung PC3-12800 (800MHz) Part No. M471B5173DBO-YKO. Also it runs windows 8.1