theCanadian

This would might explain the 8C difference across my cores..... then again, that problem existed both vert and horiz

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dragosmp

Great guide, rep+

P.S. Wish I had seen it sooner

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ryboto

All heatpipes in the available heatsinks will have wicks. If they didn't, then they would only work with gravity, so they'd only work in one orientation. Heatpipes are usually vacuum sealed, so the only material inside them is the working fluid itself. It's the heat of vaporization that makes them so effective. To vaporize the fluid requires enough heat energy to match the heat of vaporization, and for water that's 40 kJ/mol at standard conditions. I believe you'd have to adjust that for pressure, since the working pressure of a heatpipe depends on whether or not there's a gas mixture, or it's at the vapor pressure of the fluid inside.

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logan

Correct on all counts there, I just tried to keep the guide simple, so I didn't bring up any of the thermodynamics/chemistry into it, but yes, you would have to account for the pressure in those calculations, because like you said, the pressure inside is variable (depending on if its "hot" or not).

That's why the pressure inside, and amount of liquid inside is so important, because it has to be enough to transfer heat, but not enough that it will burst the tube, and also have a low enough vaporization temp to be useful. (if it vaporized at 200c, then it would be useless).

Also, the only HS that I could think of that didn't appear to have a wick, was This one by vapochill.

As you can see, it actually does have a specific orientation that is required (as the top of the unit is offset, so that it can be installed in a tower case, and still have gravity work for it), suggesting that it doesn't have a wick.

You can also see in other coolers that it is often recommended to mount it a certain way, to help the wicks (and/or the flow of the vapor) out. For instance, the noctua C12p.

see, check this out.

As you can see, they recommend mounting it with the tips of the heatpipes up, think about it... if it is mounted in with the tips down, then all of the gas will get "stuck" at one end (for the most part anyway), and it will be way less effective.

Oh, and theCanadian... that difference is probably caused by the seating of the IHS on the actual CPU die. I hear that a good lapping of the HS, (and for best results, the IHS as well) will help even up the temps quite a bit.

Thanks for the feedback guys, I'm glad that this is helping out.

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Blameless

Concerning "fake" heatpipes, I doubt anyone would dare to use them.

Quite simply, a "heatpipe" that does not have a working fluid at the right pressure is not a heatpipe and will not work. A solid metal rod of such thickness, or worse a plain hollow tube, would have such poor heat conducting characteristics as to be unable to keep most CPU from overheating at stock.

durch

From a mechanical engineer, great explanation! Just the right amount of thermodynamics to explain the topic but not lose people.

wierdo124

Great information. Rep+

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N2Gaming

Great explanation, I’m going to add it to the m2n & m2n32 club seen here. If it’s a problem let me know and I’ll take it down. Rep + for U sir

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logan

Not a problem at all, that's why we have guides... so people can see them, and be helped by them... right? So the more this gets seen, the better. So go ahead.

Good luck with your new responsibility, its looking great so far though.

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N2Gaming

Thanks, I'm still doing a lot of research, I myself will have a lot of questions about my system. I felt this thread you posted will definately help newbs understand cooling a littel more. I'm going to wadd up on links and try to remember what I have in each link so when I get those newb questions I can refer them to a guide that will be able to explain it much better then I ever could and save me some time.

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