try a GPU test and see the FPS results, then compare those to someone else using the same integrated graphics. NovaBench may be of help;
http://novabench.com/download.php
Compare your GPU results to any of these as they are all the same ATI Radeon HD 4200 graphics;
http://novabench.com/view/12092
http://novabench.com/view/157136
http://novabench.com/view/137377
http://novabench.com/view/165387
http://novabench.com/view/257744
The score is never 100% accurate, but if your getting around the same FPS as those users, then your GPU is working as it should. (those are the higher-end scorers in the rankings, so check below to see them all)
-> http://novabench.com/compare.php?k=HD+4200&n=&s=
With Temperature, hard to tell, I would use your CCC and check temps from there, then compare online