It is not possible to overclock most pc's that are manufactured from Dell, Acer, hp etc. They would not want you to hurt the cpu while oc'ing and then reset the bios and have you then get a new computer under the warranty. What dell used to do was manufacture their own mobo's. Idk if its the same for acer but i imagine so. Especially if its a laptop. Also, it is much more dangerous to oc a laptop since they do not have very good heatsincs.