My family asked and help pitch in years ago for an MSI GT80 TITAN 980M SLI rig for graduation. Mostly happy other than feeling burned when MSI abandoned various levels of support for it.
That being said, it was one of the final of these types of SLI monsters to feature the single brick.
@Just curious:
"Have you guys ever considered testing using an external display so you can do a frame-time/F-CAT analysis?
I get the feeling that the cooling solution in this laptop is coming up short, and that would show up in your frame time variance tests."
For awhile I had it hooked up to a couple of different displays(a 1080p/120hz/3d and 1440p/144hz/3d). I can at least tell you that yes, if the external display offers greater potential the rig will do its best and eventually throttling happens. I never did f-cat with mine but did do plenty of gaming. Ultimately I just use it's built-in display now and as a portable high end desktop between work and home.
Now years later having built/upgraded my desktops to 1 1080TI and the other 1080 SLI I really feel they should just abandon any SLI and just stick with a 1080TI/1440p-144hz Gsync. I know they don't exist yet but honestly that would be the best path IMO. Less power, less heat, maybe back to single brick, smaller chasis/case(maybe) and a screen that would impress most hardcore gamers.