Haswell mobile quad memory upgrade 12GB (4GB+8GB) vs 8GB (4GB+4GB)

Have mentioned this before, but never actually experienced it, to test and know for sure. Which I believe once at 12GB will be using Intel Flex mode.

I am buying a G501 that is the model with just 4GB soldered on-board. Basically one dimm slot isn't there but is in the form of soldered on-board, the other is physical, so in theory just 2 dimms. There are many other laptop make/models out there that do the same. I have no option to replace only just one module.

Out of box Asus have...

Haswell mobile quad memory upgrade 12GB (4GB+8GB) vs 8GB (4GB+4GB)

Haswell mobile quad memory upgrade 12GB (4GB+8GB) vs 8GB (4GB+4GB)