Been shopping around for some new pc parts recently to try and increase my performance the best bang for buck way possible. So here is the situation, im currently running 2GB DDR2 RAM in my system (2x 1GB Sticks), now this RAM is just standard 667Mhz RAM nothing special about it because I don't overclock my CPU. Would increasing my RAM to 4GB make a difference, would it be worth spending money to go up to 4GB? Would changing RAM to a higher grade make a difference? and if so would it be a big difference?