Hi, i have Acer4150 Laptop 1.4GHz Pentium M processor 256MB Ram DDR2, 586MHz FSB. Can i UPGRADE for 2GB RAM?

You should go to Acer website and ask that question because i think that your computer can only have 1 GB Ram like mine. Thats why you should go on their website and make sure.Hope that helped you and have a nice day! :)