I bought it off gamersgate, I used the included gg patch and the 1.7 patch.
I also tried the Armored Princess demo and had the same overheating issues.
I get smooth framerates, it's not a performance issue. There's just something about how the game is accessing the hardware that's producing extreme overheating, like state changes within a single frame or something.
Here is a thread at the Quarter to Three forums where lots of people are talking about experiencing the same problems on both laptops and desktops, so the problem is not just my own goofy computer setup:
http://www.quartertothree.com/game-t...ad.php?t=51295