I have decided to buy a Lenovo G50-45 with AMD a8 6410, 4gb ddr3 1600 mhz, 500 gb, win 8.1, i plan on adding another a 8gb ddr3 in the extra slot ( i would like an expert opinion on how it will affect , i mean adding more ram), as for the laptop( only lappy), the max i can spend is around 400$ ...