Can my IBM ThinkPad 390E be upgraded and how high?

Question

It is a Pentium II 333Mhz,system name OEM Computer

Answer 1

Well, it's obviously an old model. It would probably be cheaper for you to simply go buy a new one. But, if you want to upgrade, you should visit the IBM site and look up your computer model number (on the bottom of the laptop, usually, under the battery) and find out what you can upgrade to. Probably a bit higher of a processor - if you can still find a PII for a laptop - and you may be able to increase RAM to 512 MB max - not very much you can do with such an old system. That's why I say, you should spend your money wisely and just get a new one!