Reporting 4 mem banks but can only find 2

Hi guys, I have an Acer Aspire 5750 and cpuz and system information viewer x64 both say i have 4 memory banks but i can only find 2. I looked everywhere on the net and everything says only 2 banks but the specs also say only 8gb max, but sivx64 says 16gb. Acer website doesnt even have this model on the website anymore, i bought it used and it is about 2 half / 3 years old model. If anybody knows where the other banks are hiding or if cpuz and sivx64 is wrong any help would be great.

is there a way to do that without taking it all apart?

watching videos on people taking it apart shows only 2 banks must be some weird thing with the info apps thanks dude

Crucial thinks it only has 2:

Computer memory upgrades for Acer Aspire 5750 Laptop/Notebook from Crucial.com

It may be something as simple as the CPU & chipset being capable of operating 4 DIMM slots, but that only two were actually installed on the motherboard.