here's the link..... Acer Support - Aspire 3680 Series Specifications
The specs tell me a max of 2 GB....
and on the processor...you have to make sure the processor matches the socket.....
It seems to be a socket 478......but I'm not certain.....
here's a link of interest:
http://www.cpu-world.com/Sockets/Socket 478 (mPGA478B).html
