Right mouse click on your Desktop >> Properties >> Choose last tab(mine is in Dutch, so I don't know the name of that word) >> Advanced >> Geforce 8600GTS
You need to download Ntune to see the temps in the nvidia control panel now that I think about it. Whenever I click on the temps tab, It alway bring up the ntune monitor...
So either download Ntune or PCwizard, doesn't matter.
Artifacting is when Foreign crap appears on screen in the middle of a game. Could be little dots or lines, Anything out of the ordinary. Artifacting is generally caused by either overclocking or heat, and it's ugly.