So I used to have 4x1GBs of DDR2 800 MHz RAM (Kingston KTC1G-UDIMM) Today, I bought 3 sticks of 2GBs and now I can't watch videos in 1080p60 or play San Andreas. (I'm serious, San Andreas lags, but only San Andreas lol) My new RAM is Samsung M3 78T5663EH3-CF7. Maybe is it because I left and old stick in the 4th slot? It used to write Ganged Mode, now it isn't. Will removing that old stick of 1GB fix my problem, or it's faster to use 2x2+2x1? Thanks for your answers, and I hope you can understand my questions, my grammar is pretty bad I know.