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post #1 of 7 (permalink) Old 01-14-2014, 09:56 AM - Thread Starter
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Hello I want to know what is the ideal thickness to maintain contact between the CPU and the Dry Ice

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post #2 of 7 (permalink) Old 01-14-2014, 01:59 PM
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There is really no single school of thought on this. While theoretical calculations are possible, they are merely a starting point. Empirical testing is the best way to go with this sort of thing, unless you're an engineer with heat transfer/fluid dynamics knowledge and you have the software knowledge to apply it.

In terms of numbers, most of the pots I've seen have 3/4" to 1-1/2" of copper before the fins start at the bottom of the pot.

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post #3 of 7 (permalink) Old 01-16-2014, 04:48 PM
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There are Pot's with thin and thicker base . Personally i like the ones with thicker one , higher mass stabilizes temp swings .
The one with i use has a 2.3" or around 60mm base thickness . The other thing is how the pot is machined inside . How are the holes drilled inside to increase the surface area .
Probably for DICE a 1-1/2" up to 2" thick base depends on the design


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post #4 of 7 (permalink) Old 05-15-2014, 08:33 AM
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Hi

The thickness really depends on what kind of material you want to make the pot of.

I've made quite a few cheap alu dice pots with both thick and thin bases and 6-7 mm thick base in alu is just fine.

But the best dice pot you can make has to be made with one of these as a base.



It's not very thick but has a large surface area. One of my friend made a pot with one of these and it is perfect for dice and can be used with ln2 too it just can't handle high load processorer very well.
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post #5 of 7 (permalink) Old 05-15-2014, 08:59 AM
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Quote:
Originally Posted by Rasmus66 View Post

But the best dice pot you can make has to be made with one of these as a base.



It's not very thick but has a large surface area. One of my friend made a pot with one of these and it is perfect for dice and can be used with ln2 too it just can't handle high load processorer very well.

Those are great for a first pot and will work for really light load benching. They'll immediately run into issues and have massive temperature swings once you start applying a heavy load (WPrime, 3DMark CPU Tests, etc.).

You'll want to add some mass if you plan to do heavier load benching so that the temperature doesn't swing as much. Also, it will be difficult to get ice into the fins unless you're using powder. If the acetone is the only thing touching the area of the fins (and the dry ice is on top because it doesn't fit down between them), you won't have as much cooling capacity as if the dry ice/acetone mixture was pushed down into the fins.

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post #6 of 7 (permalink) Old 05-15-2014, 09:05 AM
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Well getting the dice down between the pins is not a big deal with the dice i'm buying smile.gif

It's 3-6 mm small pellets i'm getting from my dice pusher smile.gif
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post #7 of 7 (permalink) Old 12-23-2017, 07:50 PM
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You can also use solvents with dry ice. A reasonable number of solvents have freezing points below dry ice temperatures (isopropyl alcohol, methanol, ethanol, acetone).

When I worked in a USDA lab, we used absolute ethanol (200 proof) and sometimes acetone with dry ice for cooling.



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