I just got it replaced. The lady at Staples opened the box to check that everything was in it, but she held it on its short end so when it was opened the tablet came crashing out. Oops. Luckily these things are built pretty freakin' solid, cause nothing happened. (Tile floor, too. Not that carpet they did the drop test on at the Keynote.) The tablet feels a lot cooler now. I can actually put my hand on the back and keep it there, (unlike last time, I could keep it there maybe 3 seconds before it was painful) and the fan doesn't rev up nearly as much. I almost can't hear it now! HWMonitor is reading 90°C now, so I have no idea what the crap. Maybe the temperature monitor is screwy? Whatever, it's not a frying pan now, so I can deal with a bad sensor.
I have had concerns over the temperature mine runs at since I bought it. Even with some pretty basic metro games running the fan comes on to a medium level and the back gets warm, not super hot but certainly pretty warm. An example game would be my little pony from the windows store. My daughter loves it so some nights shes plays and I listen and feel and in my opinion it runs much hotter than it should for such a basic game. So I decided to do what you were asking and see how Minecraft performs and found it doesnt do very well. The game jitters and the cpu is at about 67C and the CPU is also being throttled to about 1.45GHz to maintain it at that temp. The back is considerably warm, not to the point where I am in pain but pretty hot. The fans run the loudest I have heard them for sure.
So are you saying that with the replacement SP3 you can now play Minecraft and it doesnt nearly get as hot?
There was also another thread where the guy was running a program called heavyload and his SP3 was getting up to 90C and then after a minute the CPU was being throttled back to 0.78GHz just to bring the temp down. He asked others to do the same so I did. I basically had the identical results as him whereas others CPU's were being maintained at 1.3-1.5GHz at that temp. This got me worried originally, now with this test I feel it needs to go back for a replacement.
I think I will wait and see what Patch tuesday brings and then do a full refresh like they recommended for you, then go from there.