I'm messing with various options for keeping my new P4 3.2 CPU cooled, trying to strike a balance between noise and cooling. I am monitoring the CPU temperature with a software utility as I mess with various things.

Two questions:

1. Where on the motherboard is the temperature sampled from? Within the CPU, or somewhere outside of it?

2. What's a good ceiling I should put on sustained CPU temperature? For instance, while playing a game like Unreal 2 at 1280x1024?

Right now it's hovering at about 114f when idling at the windows desktop, and at about 140f when looping the Unreal 2 intro demo. But in the latter state, the fan is noisier than I would like it.