What temp. should the sapphire ATi HD 4850 run at idle and crysis?

That will depend on a lot of things from your case cooling set up and which card you have with which cooler option right down to the ambient room temperature where the PC is being used.
Generally (give or take 5 degrees i would say 30 for idle and around 80 for loaded.

Mactronix :)
 



No one will be able to tell you exactly what to expect for the reasons i have already posted. As long as you are around teh temps i posted it will be fine.

Mactronix :)