This is your (Arrandale )processor:
You must contact the manufacturer of your notebook and ask them what processors are supported by THEIR BIOS.
Then, you can select from those processors.
An upgrade processor must be socket, BIOS, and chipset compatible.
Also, you may want to review this:
My notebook manufacturer went bankrupt (H BUSTER). There is no way to contact her.
That's why I'm resorting to the intel website. I ask for help because I do not understand about computers.
If it helps I have some information:
Socket 989 rPGA
Bios: Phoenix Technologies LTD. Version 6.00
Chipset: Intel® HM55
Unfortunately, only their BIOS engineers are going to be able to tell you what processors their BIOS can support.
OK thank you