Dead Winter
STAHP
Install this program http://www.almico.com/speedfan.php/
Open it up and then run a game. Play the game for a few minutes, then alt+tab and look at the temps. Look at the CPU temps. You really don't want them to ever be over 70C (I prefer around 60C). If its below that while under full load of the game, I wouldn't worry about it. If they are around there or higher I would look into some additional fans, or perhaps a third party CPU fan/heatsink. GPU is probably fine up to 80C.
Thanks Max! It actually came with some temp monitoring software and I fired it up and played a bit with it recording my gameplay temps. It got just over 50C so I'm quite happy with that.