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Whats phase change?

post #1 of 37
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What EXACTLY is phase change cooling?
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post #2 of 37
In simplest terms, it's basically like an air conditioner for your computer except instead of blowing cool air into it, you attach it directly to your CPU and it gets chilled down to sub-zero temperatures. It works exactly the same way as an air conditioner, and uses most of the same parts. Basically, you have a refrigerant, which is a gas with a very low boiling point. You put this gas in a closed loop system, then with a compressor put it under pressure until it condenses back into a liquid. Then you pump that liquid to the evaporator head, which is on the CPU, where the liquid boils and evaporates back into its gaseous state. In that phase change (state of matter change, liquid to gas), a large amount of energy is taken away from the CPU, energy in this case being heat, cooling the CPU to very cold temperatures (about from about -50C to -20C depending on heatload and the quality of the unit). The gaseous refrigerant is then pumped to the condensor, which is basically like a radiator, where it's cooled by fans until it condenses once again and the process repeats itself.
    
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post #3 of 37
So, what's a phase change system cost? And how hardcore can you overclock with one?
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post #4 of 37
Well, It all depends on what kind of a system your using.

Generally 4.2Ghz+ with intel, And 3.0Ghz+ in most cases with AMD.

The costs can range from $300-10,000 ($10,000 being the triple-cascade phase change systems, one compressor cooling a gas, that will cool another gas, So on so fourth).

If you check out a couple of guides around the internet, Making your own is rather cheap as long as you can get ahold of the tools/gas you need. (Having a friend with an HVAC degree helps too! )
post #5 of 37
These things look pretty gigantic, though. What's the real benefit over standard liquid cooling? Sure the phase changer temps are a negative mulitplier lower, but does the phase changer system really affect what you can do with your processor?
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post #6 of 37
Well, The colder the transistors in the CPU are, The faster they can go, Allowing for a higher Overclock, Which will give you more CPU to utilize for certain apps/games.

I.E, Run a benchmark at 2.93Ghz, Then overclock to like 4.2Ghz with the Phase-Change and run that same test and see how much more scores have improved.

It because there is more processing power there for the benchmark to use.

(wow... what a wierd response eh? Saying the same thing two or three times.. lol?)
post #7 of 37
And it still sounded quite classy until that last bit. XD

What I really don't get, is if you can cool something 50 degrees less, can't you clock it SO much more? Like, just clock it until it starts seriously heating up again? Or do other things limit overclocking, too? Like power and ram clocks and other things?
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post #8 of 37
Well, like I said, The more heat the transistors have, The slower they will switch between 1/0 (open/closed, blah, blah, blah...).

When they're, For say, -50º, The transistors will be able to switch faster because they have less heat putting a burdon on the them.

Once again though, Even at a point they will run into the same issue with heat. Even if its at -50º, When they are going from 1/0 so fast, That they will need to be even colder to switch faster.

Although at some point they just get too cold to go from 1/0 at all, Which sucks, lol.
post #9 of 37
So you're saying that at a certain point, you reach instability even though the temperature may be -50ºC?
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post #10 of 37
Yeah, like if a 3.2 chip runs on water cooling at 4.0 and 20C, a 3.2 chip on phase change at 4.0 would need to run at even colder than 20C? >.>

Something's not clicking for me.
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