I have a Toshiba Portege M780-S7240. It's an i7, 64-bit and currently has 4GB RAM. I'd like to upgrade to 16GB. (If it matters, I'm running 64-bit Ubuntu.)
I checked with a RAM vendor who said it wasn't possible with my config, and saw the user guide says:
"Configured with 4GB (2GB+2GB) DDR3 1066MHz (max 8GB)"
What causes this hard limit? What exactly is the limitation or combination of limitations that keeps it from supporting 16GB? Is it the motherboard? Is there a firmware upgrade I can do to get beyond this?
EDIT
Here's a link to the specs from the manufacturer. (It's a PDF.) I've been told that these PDFS are created before release, and usually not updated as firmware changes.
Best Answer
I believe the memory controller of the Intel HM55 chipset has this limit. Looks like a design fetaure/limit related to Intel's design. The exact model of your Protege 780 might result in some additional feedback from others