I am curious what is the highest/largest amount of RAM available in a laptop. Yes I ask this question because the intent is to have multiple virtual machines running at once. I understand there are other key factors such as brand, cpu and i/o throughput, but I am curious with current technology what is available.
I would imagine 32GB, as that is what most desktop systems are limited too. But more realistically it would be 16GB most likely.
Though for your purposes, I wouldn't get a laptop. You really need a desktop for that kind of work.
If portability is a concern, you could build yourself a fairly strong ITX system that would be easy enough to move around.
Depends on Dimm slots and OS. For instance windows 7 ultimate x64 can support 192gb of ram and if you had 20 dimm slots on your MB you could test the limits of that OS. Considering most laptops use 2-4 dimms figure 4x8=32gb to be the normal limits