Ahh ok, actually not something I want, so I'll have to bear that in mind, so good to know.
Any idea about whether both slots are equal, or is that going to vary.
Here's my predicament. I had to replace the keyboard after ants caused damage. I picked up a pair of 8Gb ram in the UK, so installed them all at the same time. But wouldn't boot after. Then wouldn't even power. HP say it's needs a new Mainboard and the DC in needs changing (The main computer shop kind of mashed it up dealing with a charging issue 2 years ago). Having maxed the RAM, the only thing that can make the laptop better is an SSD. As it's going to be 2-4 weeks for the new part, maybe now while it's all open I can sawp the HD for the SSD and install the caddy. Before HP close it, add their stickers for warranty on the new board. With teh Caddy I can add the SSD without opening it up.
I guess I could just swap the HD for the SSD, then use the caddy to add the HD back in after it's first boot.