Originally posted by SPQQKY
After lapping my IHC and my SLK-947U and switching from OCZ Ultra thermal compound to Geil's copper and silver mixture, I got zero difference in temperatures. Oh well, nothing ventured, nothing gained.
This is somethjing I'm about to write on but I have so many things to write, I'm sitting here doing nothing. I'm so confused I don't where to sart? I have to find a new girlfirend just to help me get organized.

Anyhoo....I had an interesting talk with Nevin (Arctic Silver) and he made some very interesting points about lapping. Although in your circumstance it might not seem applicable, I beleive it may be.

Albeit a P4's IHS, or a Swiftech heatsink base, there's usually either a slight concave, or convex curvature in one or both surfaces. What happens is, when people lap, they might eliminate a convex surface where the protrusion made better contact with the heatsink surface. Lets say your heatsink base is slightly concave, and the CPU was slightly convex. You lap both surfaces. Because, your measuring your sucess by laying the heatsink, or CPU on a flat surface, the concave's deepest point may still exist. because the edges of the indentation will support it over the flat surface you wouldn't know. Ergo, by lapping the convex surface, you've now eliminated the point which protruded up from one surface, and made contact by fitting into the concave indentation.

Ergo the lapping of a single surface, albeit the IHS or heatsink, only gives you a 50% chance of improving contact. If the heatsink is convex, and the CPU concave there's a possibility that combination may fit together better then a poorly done lapping job on both surfaces.

Solution. Take a razor-blade and lay it over the surface of the CPU, then over the heatsink surface. The resulting discrepancy will enable you begin lapping with a much clearer picture of your goal, or at least upon which surface your going to have to lap down beyond the deepest part of the convex surface indent.

nailbomb (still love that username hehe) I'm not sure why but i don't rmemebr talking about mounting "pressure" being inadequate with the P4PE? Don't both those boards have mounting holes? That heatsink should be mounted through the board. I've yet to see a high-quality heatsink such as a Thermalright, or Swiftech which doesn't offer such hardware, and also recommends this as the preffered mounting method.