Sapphire HD4870 with Glorified Heatpipe Cooler (aka Vapor-X)

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First of One - 16 Sep 2008 00:20 GMT

http://forum.donanimhaber.com/m_26505245/tm.htm

Unfortunately, the top card will still choke in a Crossfire setup, if the
two cards are installed next to each other. Nvidia's fan design (with a
slight cant) is superior in this regard.

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William - 16 Sep 2008 01:06 GMT

> http://forum.donanimhaber.com/m_26505245/tm.htm
>
> Unfortunately, the top card will still choke in a Crossfire setup, if the
> two cards are installed next to each other. Nvidia's fan design (with a
> slight cant) is superior in this regard.

Quit taunting me with that German stuff.

All that good stuff and I can't read any of it. Nice pictures.

Here's a question for you First. Those heat pipes, are they filled with
some type of salt/sodium solution for heat transfer? It amazes me that
those pipes can move that much heat within themselves. I really don't see
how. Those pictures only show a small section, maybe 3", exposed to the
fan. That isn't much for cooling those pipes. What is it with this
infatuation with heat pipes anyways?

William.

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First of One - 16 Sep 2008 01:59 GMT

> Quit taunting me with that German stuff.

Not German. Donanimhaber.com is a Turkish site. I have no idea how a Turkish
site gets intel before the Chinese sites, considering where the cards are
made. And no, I can't read Turkish either.

> All that good stuff and I can't read any of it. Nice pictures.

The two important numbers in that article are 780 MHz core and 4.0 GHz
(equivalent) RAM, which represent increases of only 4% and 11% over the
reference clocks. The third important number, in dB, won't be available
until some reputable site gets a retail sample.

> Here's a question for you First. Those heat pipes, are they filled with
> some type of salt/sodium solution for heat transfer? It amazes me that
> those pipes can move that much heat within themselves. I really don't see
> how. Those pictures only show a small section, maybe 3", exposed to the
> fan. That isn't much for cooling those pipes. What is it with this
> infatuation with heat pipes anyways?

Could be salt/sodium solution, freon-like refrigerant, or just plain water.
The important thing is to keep the fluid at lower-than-atmopheric pressure.
Heat pipes work by evaporating the fluid at the GPU plate. The vapor then
condenses at the radiator fins and flows back to the GPU plate through
capillary action, allowing the process to repeat. The fluid >> vapor phase
change absorbs a lot of heat.

The 3" section of heat pipe seen under the fan hub is actually from the GPU
plate. Exposing it to the fan was not the intent. The heat pipes are meant
to dissipate heat through the radiator fins (which catch more airflow).

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"War is the continuation of politics by other means.
It can therefore be said that politics is war without
bloodshed while war is politics with bloodshed."

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