Kingwin RVT-9225 Heatpipe Direct Touch CPU Cooler
Author: Frank Stroupe
Editor: Shawn Knight
Date: 10-15-2007
Provided by: Kingwin Technologies
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Introduction

I really thought that heatpipe CPU cooling technology had pretty much reached as far as the current PC standards would allow. Three pipes are about as much as you can cram into a CPU heatsink, and a radiator that will support a 120mm fan is as large as most cases will accommodate. Generally, the coolers are copper, aluminum, or a combination of the two, as are the heatsinks themselves. Radiators are configured either parallel or perpendicular to the motherboard…generally anyway, I saw one the other day that was at an angle to the motherboard. Some radiators support a fan on both sides.

But, Kingwin, along with a small handful of other manufacturers, has come up with a new idea: configuring the heatsink to expose the heatpipes, and allow them to directly touch the CPU heat spreader. Kingwin calls this H.D.T…. Heatpipe Direct Touch.

Now, I'm no thermal engineer, but I do realize that you lose some amount of thermal transfer efficiency going from one object to another, i.e., from the heatsink itself to the heatpipes running through it. Actually, I have thought of this before… a few years ago, I reviewed a CPU cooler that had an aluminum heatsink, with a copper insert in the bottom that actually touched the CPU surface. While copper is much better at transferring heat than aluminum, I wondered how much efficiency was lost by the transferal from the insert to the cooler base. Yes, the machining between the two was excellent, or appeared that way to the naked eye… but what would a microscope show? It was a pretty nice cooler, and did what it was supposed to, so I really didn't worry about it.

The idea of exposed heatpipes makes sense. Besides the transferal of heat between the heatsink and heatpipes, the heatsink block itself can be made of aluminum, allowing lower manufacturing cost and less weight, since it serves only as a mount that holds the heatpipes against the heat spreader. We'll see just how well this new idea works.




The cooler is packaged in this attractive box. A photo of the heatsink base is on front, and specifications and applications are on the sides and rear.

The cooler inside is well protected within a cardboard insert. Kingwin does their part for the environment here, all packaging is recyclable cardboard.

Let's take a look at the cooler


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