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Direct touch pipes.

post #1 of 10
Thread Starter 
So the last time I built an air cooled system I went on a search for the correct cooler for me. I ended up picking up a T.R.U.E. and for it's time it's cooling was epic! It blew everything out of the water when it was released! I loved that thing cause even with very little air flow it could keep the cpu's cool enough for great overclocks.

But back then we had a few of the first Direct touch cooler come out, and if I could remember them I'd post which ones. But the general consensus back then was that they weren't as good, that the cracks between the heat pipes and the channels holding the heat pipes was large enough to actually impede the transfer of heat. Most people used to dismiss direct touch heat pipes for that very reason.

It's feels strange now to go look at the heat sink section of newegg and see so many direct touch coolers. And honestly I still believe that the cracks impede heat transfer. So What are some of the best non-direct touch heatsinks, or prove me wrong with my prejudice.
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post #2 of 10
i got an athlon II x2 250 at 3.85 using a Dark Knight heatsink and load temp never gets over 38c
post #3 of 10
It is all about the direct contact. With "regular" heat pipe coolers, the heat has to transfer from the CPU to the IHS to the material of the Heat sink then to the pipes. With direct touch, you take out that layer of transfer from the heat sink material (usually aluminum) and it now goes directly to the (usually copper) heat pipes.
There are arguments the other way also, that you have a smaller contact area and then the "gaps" that are there. While this is true, it is made up for by the faster heat transfer of the direct touch.

While I have no major "proof" I know my x3 at stock clocks with the stock AMD heatpipe cooler would hit 55°+C all the time while folding SMP, but as an unlocked x4 overclocked to 3.2, slight voltage bump with a Xiggy, it rarely gets above 47°C.
While the OEM heatpipe cooler from AMD is not the greatest, it is not too bad.

I also went from a AC Freezer 64 Pro to a OCZ Vendetta 2 (both 92mm fans, about the same size overall) on a 3600+ x2 and the OCZ was 2-3° cooler on that also, both idle and load.
Edited by blupupher - 6/11/10 at 2:29pm
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post #4 of 10
Thread Starter 
Oh no AMD coolers are great, my old Athalon 64 x2 6400+ had a huge heatsink that came with it. Well huge for the time.

I mean I was looking at the Venomous and it's right up there with the best coolers and it's not direct touch.
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post #5 of 10
The Nvidia "Fermi architecture" GTX 470/480 stock heatsink has direct touch heatpipes FYI.
post #6 of 10
Thread Starter 
Aren't those some of the hotest graphics cards to date?

Though I doubt those are hotter then my reference HD4850. xD
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post #7 of 10
Quote:
Originally Posted by WTHbot View Post
Aren't those some of the hotest graphics cards to date?

Though I doubt those are hotter then my reference HD4850. xD
They would be hotter without the HDT.
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by blupupher View Post
They would be hotter without the HDT.
Unless you have numbers then making that assumption is not helping.

Megahalems and Venomous are not HDT and like I said before they are some of the best on the market.
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post #9 of 10
The very best heat sinks still use flat bases rather than HDT. Direct touch heat pipes reduce costs slightly. They have gaps and are more rough than a good flat base.
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post #10 of 10
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Quote:
Originally Posted by boredgunner View Post
The very best heat sinks still use flat bases rather than HDT. Direct touch heat pipes reduce costs slightly. They have gaps and are more rough than a good flat base.
This is what I've always thought, and the very fact that they do have cracks that large means that no amount of TIM will transfer the heat well enough.

So it looks like I am gonna go with a Venomous X on my next build.
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