Whenever UMC gets the green light to start pumping out T-breds/Bartons they should put a heat spreader on it since heat dissipation seems to be a big problem with the new 0.13 Athlon. Who knows, might get a few more mhz out of it. Although, with the addition of the extra cache on Barton, I guess heat dissipation wouldn't be as much of a problem since it's going to be over 20 sq.mm larger than the thoroughbred. I wonder how the shrink to 0.09 would affect the thermal dissipation of the K7.
Think of it this way: having a heat spreader is functionally the same as cutting a 3/32" layer of metal off the bottom of your heatsink and attaching it to the CPU core with thermal epoxy. When the larger part of this hacked-up heatsink gets put back on, you end up with an imperfect fit where the heatsink got cut in two. This doesn't improve heat dissipation; it hinders it.
If the heat spreader is of a more conductive material than the heatsink itself (i.e. as in the Silverado, where the main heatsink block is aluminum, but the contact surface is a slab of pure silver), then it might help. But this usually isn't the case, especially with the P4's stainless-steel heat spreader.
A heat spreader aids in heat dissipation only if there's no better passive cooling on the core.
<pre>We now <b>return</b>(<font color=blue>-1</font color=blue>) to an irregular program scheduler.</pre><p>
Whether its better or worse, at least you won't see any more posts like, "Is the core important? I think I might have chipped it. Will this cause any problems. If so, can I return the processor for a new one".