Temperature problem and lag

[Sentential]

Well! my very core temperature now is 58 idle on the desktop, and when I surf ago when I play, it surprised fully up to around 70 degrees

Had sent my computer to repair, so had them sent back with a new motherboard and put it, they took on new paste, but there are few big problems sooner.

What can the problem be? Be the chassis fan, cpu fan & "GPU fan / or what it called"

I hope you will help me, get some lag from time to time in WoW.

[JAMES_911]

Uh, 70 degrees is quite common when playing games.
As about the lagging of the game, does is give any error?

[Sentential]

No error is given. It just lags.
BTW, I check the temperature with speedfan & tear turner.