Thew Model of the Acer Computer here. But regardless you need to look in the User Manual that came with the computer to see if it is possible to change the CPU.
Some Computer Makers buy in M'Boards with the CPU Soldered to the M'Board and you [b]Can not[/b] replace these CPU's when the either Fail or require Upgrading. While it is correct to say that this is determined by the M'Board we need to know the Make & Model of the M'Board not the Part Number from a System Makers.
You can download the Users Manual from here on the Acer Web Site but you'll need to enter then Model Type and Number to get it.
http://tinyurl.com/6x28g3
Unfortnatly many System Makers buy M'Boards from the Big M'Board Makers and they are built to order and not sold to others only the System Maker so the M'Board Makers offer no support for these M'Boards in any form they are the Property of the Company who Ordered their Manufacture and they are the ones expected to support them.
This one appears to be a MSI M'Board but MSI do not have any Information relating to it on their Web Site so you'll need to look at Acer for all your Answers.
Col