I have an Elitebook 2570p with 4gigs DDR3L 1600 freq and I just added 4gigs DDR3 (same) freq 1600 because it was pretty cheap.
I found that even though most people say it's OK to mix the two, some did have problems.
But most generally the people with DDR3 who added DDR3L that were asking, I'm in the contrary situation.
I would like to check my the voltage on which runs the components of my Computer, especially the processor and the DDR3L RAM to see whether it is dual voltage, and whether there would be no prob with the DDR3.
Does any one know of a way to check that? my bios (68ISB Ver. F.31) does not give that info (btw a lot of its features are grayed-out)