Dell :: M4400 Precision Cpu Temperature

Here's the background...

I recently received a new m4400 (with a T9400)and had a problem with one of the cpu cores running 6-8 degrees hotter at idle (not under load). When I told this to Dell technical support, they reordered me a new notebook.

Here's the problem...
I received my new replacement notebook. Although the cpu cores are now the exact same temperature at idle, once I start running some programs (simulation games, etc.), one of the cpu cores runs 7-8 degrees consistantly hotter than the other one. If I stop playing these games, both cores return to the exact same temperature .....