xJumper

I was walking to a local K-Mart for some gamer food (slush & Twinkies) and I saw this small busines trashing all it's computers outside in some sorta dumpster so I looked in and actually picked up two Pentium Ds from broken cases, they guy didn't seem to mind... lol Anyway since I got nothing to lose I thought about taking my first shot at some high OC'ing Benchmarks using Extreme cooling.


My question is what is the differance betwen using LN2, Dice or Phase change? I know that LN2 is the coldest of the three (-200c) followed by Dice average (-100c) and then phasechange which is like (-60c) but since they all cool the CPU way past subzero there is no way you could OC and ad enough voltage to get em back up to any dangerous temps so whats the point of freezing it to -200c w/ LN2 instead of using something like Dice? You would probably get it to die faster with LN2 because of even bigger cold shock.

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Kriegen

Once aspect, LN2 and Dice are limit duration since once you run out of them, you're done with that run. Phase Change is a more permanent solution since it's based on an external unit continually removing the heat from the CPU

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xJumper

Yea I know that but is there any differance betwen using a colder temperature LN2 -200 vs Dice -100 or even Phase -60 because I doubt there would be enough CPU voltage to bring the temps back up to a dangerous level even with -60 Phase but im just making sure.

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coolwhip

the point of using the extreme colds isnt only because of cpu's over heating. its to stop, or well, slow down electromigraton. this is where the electricity going through the cpu wears at the transistors, in simple terms. at absolute 0, there is no electro migration, and the it would become a superconducter. but since absolute 0 is impossible you would want the next coldest thing, being ln2, so you can use more volts without straight up just killing the cpu as if it was at ambient temperatures. ln2 is the most coldest option making it the best. plus phase is pretty expensive. ln2 itsself is cheap, except you would need a dewar which are worth a pretty penny. but i think a lot of places will rent you a dewar for pretty cheap.

AMDLUVR

If it's just for mostly fun, why not just get a nice big Pelt or two? Phase will take a lot to set up and the others, as mentioned, are temporary and run out.

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xJumper

But wouldn't you need really high temps in the +c's to really start damaging the proccesor? The way I see it right now is if you keep the temps bellow anything really high in the danger zone it wont matter whether your CPU is @ -80c (Dice) or - 150c (LN2). So if I am right, that would translate into the fact that I wouldn't get any higher OC's using LN2 vs Dice? Right or Wrong?

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MrMason

Wrong, when you are dealing with those super high overclocks, the killer is the voltage you put through the chip, not the temperature. The colder you get, the more voltage you can put through with less electron migration

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Turnoz

Its all about electromigration. When increasing the voltage, it increases this factor. Pretty much, the electrons jump around and cause shortages which kills the CPU. With colder temps, it makes that lowers that effect and allows higher voltages.

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Starbuck5000

Like mentioned above phase is a better 24/7 solution. However I get the impression that you are just interested in extreme cooling and just want to dabble your feet in it?

If thats the case Dice is the cheapest of them to run. A dice pot costs less than a water loop and dice is relatively cheap. The problem with phase(will call it single stage(ss) for the rest of this as that is likely what you are looking into) is the cost for a unit.

SS will generally be about -35 at load. A very good pot(like F1 EE's) will get you about -70 at load. Ln2 I've not used so I can't pass comment.

I would go for dice if your just wanting to look into extreme cooling, less financial commitment and also more exciting. There's more to learn from dice so there's a long term statisfaction from mastering that

xJumper

So if it's all about temperature that's stopping electronic migration or whatever than to get the best I would need to get the coldest substance (assuming I can get my hands on it) Liquid Helium which is only a few degrees away from Absolute Zero would give me the best results?

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