^ well actually I found that my crashes and absence of gfx card are related.
The SMC reset restored the NVidia card, and it worked fine - until I put the computer to sleep; next wake up, it crashed. Rebooted, after that the NVidia card was gone again.
Gonna take it in soon. I think it's probably bad hardware at this point. Those retina MBPs sure have more than their fair share of issues...
My rMBP still suffers from this issue and I've tried every fix I could find. Its definitely not overheating, its just being needlessly cautious.
I brought it in to the Apple store (I have Applecare too) and they told me it was Window's fault since I demonstrated the throttling using stress testing and system monitoring tools in Windows. They refused to look into the issue further, blaming it on Windows software. Hehe.
There are still threads popping up about this issue and it hasn't been resolved fully by Apple yet, probably cause in many cases a replacement machine is the only "fix", so their reluctance is understandable.
I am on my fourth logic board and Apple refuses to replace the computer. The latest reason for logic board replacement was a failed GPU. It's truly incredible.
These issues are well known by Apple.