Will using Ram 533 Mhz vs ram 400 mhz hurt my computer?
If your motherboard can support 533 Mhz then no, not at all.
If it only supports 400 mhz then yes
If your a guru and want to run 533 mhz then overclock...
But it think if you are running your ram at 533 as an upgrade, i
think time for a new computer buddy :)