Chances are the motherboard is only able to support 800 MHz RAM. Unless you are overclocking, it won't make a difference. I cannot stress enough that it isn't a good idea to overclock a laptop. You can upgrade the HDD to a 7200rpm'er though, but it will cost you a bit more than a 5400 rpm drive. A 7200 rpm drive will feel a bit "snappier" than a 5400 rpm drive, i.e. maybe a second or two faster in program loadings and a few seconds faster in booting.