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Please explain 'bowed' to me - Page 2

post #11 of 23
Thread Starter 
Ok...kinda...

First, Thermalright HSFs have convex bases in one axis, yet virtually everyone laps it flat and claims better temps

Second, It would seem the mounting angle would be 90° different for dual and quad cores based on this distribution


Third, lapping the IHS, which I thought was also de rigueur, would make it flat. Otherwise, the concave shape is rather random.

Fourth, are we saying the bow is to overcome a deflection caused by the mounting plate on a relatively thin base? If so, would the goal be to bow enough to have a flat lapped surface to lapped surface interface?


Fifth, how do you control the shape of the bow and prevent ending up with a convex shape making point contact?

Thanks,

David
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post #12 of 23
Thread Starter 
The theory in the last post indicated the bow compensated for deflection in the waterblock. However looking at the D=tek Fuzion plate I can't see how it would deflect when clamped to a flat surface.

Does the bow simply compensate for too much thermal grease?
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post #13 of 23
Quote:
Originally Posted by DavidNJ View Post
The theory in the last post indicated the bow compensated for deflection in the waterblock. However looking at the D=tek Fuzion plate I can't see how it would deflect when clamped to a flat surface.

Does the bow simply compensate for too much thermal grease?
It's magic; that's how it works.
    
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post #14 of 23
Quote:
Originally Posted by RonindeBeatrice View Post
It's magic; that's how it works.
......I just wish he would condense all these lame BS theory threads into one, he has to have a half dozen going now....
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post #15 of 23
having a slightly bowed out heatsink/waterblock base doesn't hurt much at all. Having a curved in base where contact is best around the edges, is much worse.

Pefectly flat all the time would be ideal, but in the absense of that bowed is the next best thing.
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post #16 of 23
Thread Starter 
Quote:
Originally Posted by ira-k View Post
......I just wish he would condense all these lame BS theory threads into one, he has to have a half dozen going now....
Do I detect an editorial comment?

Just trying to sort though the old wives tales to come up with the facts

Joe Friday: "All the better to get the facts. I just wanna' get the facts, ma'am."
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post #17 of 23
Quote:
Originally Posted by DavidNJ View Post
Do I detect an editorial comment?

Just trying to sort though the old wives tales to come up with the facts

Joe Friday: "All the better to get the facts. I just wanna' get the facts, ma'am."
David you don't even know the difference between head and PSI...How are you going to bust any WC'ing old Wife tails?

Honestly if you don't want to just try the stuff yourself and are more interested in "Theory" there are a lot of guys at XS that can explain it pretty well to you....
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post #18 of 23
Thread Starter 
Quote:
Originally Posted by ira-k View Post
David you don't even know the difference between head and PSI...How are you going to bust any WC'ing old Wife tails?

Honestly if you don't want to just try the stuff yourself and are more interested in "Theory" there are a lot of guys at XS that can explain it pretty well to you....

From Wikipedia: "Hydraulic head is a specific measurement of water pressure or total energy per unit weight above a datum."

Eliot Spitzer of course has a different definition...in his case head leading to pressure...
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post #19 of 23
PSI is a unit of measurement (pounds per square inch)...PSI will vary with whatever liquid is being pumped, the head rating is constant...A pump will have the same head rating with water or oil,if it has 18' of head it will have the same head with water or oil, its a measure of pump energy...The PSI is variable dependent on what liquid is pumped, more viscous liquid will have a higher psi then water....Thats more then I even want to know, it has little to do with WC'ing....

Not to say a pump wont cavitate with more viscous fluids, it will, but the pumps energy will remain the same while the PSI will vary....
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post #20 of 23
Thread Starter 
After reviewing things a bit more I think I understand the advantage of bowing.

The clamping force is fixed at a maximum of around 70 pounds of force. Bowing significantly reduces the amount of area being contacting the IHS, by as much as 70% judging from TIM pictures that have been posted.

In addition to the obvious observation of displacing excess TIM, the increased pressure must improve the heat transfer between the surfaces. This increased pressure occurs along the hottest part of the IHS, increasing the thermal cooling effectiveness where it has the most direct effect on core temperatures.

Net, Other than compensating for a faulty TIM application, bowing's increase of pressure between the IHS and water block at the (reduced) contact area improves cooling more than the reduction in contact area reduces it.

This would also explain why the addition of the backing plate also reduces temperatures.
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