"Because Ivy Bridge is a much smaller (22nm) and advanced chip, it runs much hotter when processing. It is normal for it to get really, really hot. If you are still worried about temperatures though, follow this guide- How to reapply thermal paste to MacBook Pro 15"" Retina Display Mid 2012 CPU and GPU
(Experience: I've been working with computers since DOS came out, and have a Computer Hardware Repair Service. I just updated the guide, and can say from personal experience that it is a pretty easy upgrade if you have all the required parts!)"
"First Adobe Flash player is a known heater! get the 64bit Beta version ASAP.
There is some controls you can use to set which GPU to use the internal Intel or the external Nvidia GPU. While I too love the retina display technology it comes with a price. When you use full resolution the external Nvidia GPU is used which does get the system hotter. If you aren't viewing high res images I would switch to the internal GPU using the low resolution mode. Review Apples FAQ Retina display resolution
Beyond that you should speak with Apple as it sounds like something is running wild (process?) your system shouldn't be getting that hot. Using an inferred thermometer measure your system and then go to an Apple Store and measure one of their display units running the same thing (same settings).
In any case I would hold off opening your system to redo thermo paste. A brand new system shouldn't require this (this will also void your warranty).
The mobile Ivy Bridge has a stepped clock so it runs as a slower clock speed with light tasking across all of the cores then when needed it steps into a higher clock speed and can run in dual core mode Vs quad. This allows the CPU to run cooler when it's not being heavily loaded."
I've been using SMC Fan control with my RMBP since I got it. For me at least, no interference with the mac taking over to raise fan speeds when it gets hot. I just have it because with or without it, lion takes a LONG time to do anything to raise it. I'll hit 200 degrees F before it even starts upping it usually. I ended up putting it back on since even if it can't monitor the heat (I have Temperature Monitor installed for that) at least I can proactively fire the fans up to max if I know I'm going to do something that's going to create a toaster on my lap. But if I don't change anything manually the laptop still speeds up the fans on its own. Just not as quick as I'd wish (again, same delay even without smc fan control installed).
