By having enough contact to stay below the point at which the CPU downclocks or stalls itself to keep from overheating, of course. Its a feature of current Intel chips.
You should. It might be the HS's are concave or convex. It may also be that the IHS is not touching the CPU cores well.
Here's a 5340 that had poor core-ihs contact: http://www.mediafire.com/imageview.p...j1wdra&thumb=6
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