C2 Extra SDRAM
It is theoretically possible to add another bank of SDRAM chips to the XO laptop to double the amount of SDRAM in the system.
While we have only the highest esteem for the author of this modification, it is NOT recommend for the general public, as there is a good chance that you will destroy your motherboard.
Here are the instructions.
This modification was developed and documented by Gary Chiang, of Taiwan.