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Doomsday PC-Cooling With Dual-Cascade Coolers
An anonymous reader submits "Four (4) compressors cooling one PC! Yes, it's big, yes it's heavy, yes it's loud and yes it does get your CPU and GPU cold, very cold. Is -100C cold enough for you? Cascade cooling is yet another chapter in a Finnish overclocker's neverending quest for optimal PC performance. Those things go down to -80 to -100C and can maintain the temperature. See here for the whole article with the pictures of the project."
....wouldn't they just put their computers outside to get this kind of cooling?
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It's not cold enough unless it can offset global warming. AND refrigerate my beer.
(\_/)
(O.o) This is Bunny. (> <)
A Beowulf cluster of compressors on a Beowulf cluster of computers!
Umm.....
It is pitch black. You are likely to be eaten by a grue.
Yes, it's big, yes it's heavy, yes it's loud and yes it does get your CPU and GPU cold, very cold.
You talking about my wife?
New year Resolution: Don't change sig this year
Doesn't it defeat the purpose of overclocking?
I thought you did that to get more out of your CPU than what you paid for.
If you are spending more on the cooling than on the computer, then why not get a faster one, or a second one (or dual, or whatever)?
Heh, I guess there's the whole hobby "I do it because it's fun!" thing that explains it...
Treehugger? Treehugger... Treehugger!
I don't know much about this kind of cooling, but if the compressors are being used to cool the air going through these machines, wouldn't they be worried about physically damaging the machines by cracking them? Keeping a computer cool is all well and good, but at a certain temperature the physical elements composing the hardware are bound to contract different amounts, causing damage. Maybe this only happens at -250 degrees, and not -100, but presumably there is a reason that hardware manufacturers state a minimum operating temperature for their components.
Alphanos
What's the finnish word for ... compensating?
Just that - Why?
Hey, I can appreciate water cooling. Keep the chip at basically room temperature, it increases its life and the OC'ers can push it a bit. But -100? WHY??? What possible use can this serve?
It doesn't even seem "cool" at this point (beyond the obvious pun). Wasting hundreds of watts, taking up way too much room (extra-large form-factor, anyone?), needing a fork-lift to move it... How does any of that benefit the PC or user?
Some things have an upper limit to what still constitutes "bigger/better/faster/harder". This definitely crosses that line with regard to chip cooling techniques.
when you have an accident with liquid nitrogen you lose a finger. when you have an accident with liquid helium, you lose parts of the neighborhood.
You're thinking of liquid hydrogen, not helium. Liquid helium is damn cold, yes, but it won't explode.
Government's idea of a balanced budget: take money from the right pocket to balance...oh who am I kidding?
Summary: Four (4) compressors cooling one PC! Yes its big, yes its heavy, yes its loud and YES IT DOES GET YOUR CPU AND GPU COLD - VERY COLD - EVEN DAMN COLD! Is -100C cold enough for you?
Intro
If you are an overclocker you know that keeping things cool is the key for big clockspeeds. The cooler that comes with the CPU ain't going to get you very far. It must be replaced with better cooling if you want to get really high clocks out of your hardware. But what is good enough? Even the biggest and baddest heatsinks won't get your temps much colder - in other words they wont give you much extra in terms of MHz. Watercooling is a nice option cos it has huge cooling capacity but does it really give you a big gain in CPU speed? Usually no because it can't get colder than the air cooling the water. So what can you do if you really need to get more speed out of your system??
Vaporphase cooling is the answer here. Vaporphase cooling is what keeps your freezer and ice cream cold. Vaporphase cooling is what 'all the xtreme-overclockers' are using nowadays. Several people have noticed that going from +40C to -40C makes quite a difference in CPU overclocking potential (talking about 200-600MHz here). There are even commercial solutions that go all the way down to -40C and even a bit colder. If you feel that you must get one of these just go to nVentiv website, check who is your local reseller and get one
But what if you are a real speedfreak and -40C ain't cold enough for you?? Well there is always dryice (-79C) or Liquid Nitrogen (-196C) or even liquid Helium (-268.6 C) for you but the problem is that its not really possible to get constant CPU cooling with these. LN2 and helium are actually too cold for your little CPU - it just wont operate properly at such low temps.
But you know those low-temp freezers they use in labs? Those that go down to like -80..-100C and can maintain the temperature. Good temps for CPU cooling eh?
These are cascade vaporphase coolers. They are called cascades because of multiple cooling stages (normally two). First stage uses 'normal' refrigerant like R404 or R507 and cools down to around -40C. The second stage uses a special low temp refrigerant like R23 or SUVA95 or R1150 and can get the temperature down to -100C level. The first stage evaporator is cooling down the condenser of the 2nd stage - this makes it possible to use a refrigerant with very low boiling point in the 2nd stage. Normal cascade design uses two compressors - one per stage. This also means that it is not a very compact cooler.
Here is a picture of such a freezer (the door has been ripped off):
Cascade cooling is yet another chapter in my neverending quest for optimal PC performance. I've tried quite a few cooling solutions already (waterchillers, peltiers, R404 vaporphase, dryice, ln2 etc.) but cascade vaporphase was something new to me.
This time I was lucky enough to locate not only one but TWO cryofreezers - both were supposed to be broken - so I got them for free.
The first one (the one in the picture on page 1) had problems with the system fan and because of that the owners decided to send it to the junkyard. True, there really was a problem with the fan. It didn't blow any air at all - but then again no power was coming to the fan powerconnector. I made external power input for the fan and it started to work nicely. With the freezer door closed it would get the inside temp down to -91C.
Obviously it would do nothing for PC cooling in its original form so I had to convert it to a CPU cooler.
Testing cascade stage 1 - its charged with R404 refrigerant and it went down to -40C.
2nd stage parts installed - CPU cooler is ready for a test run.
Its working! First test run got it down to almost -100C with no heatload. Pretty good with R23 refrigerant (boiling point @1bar = -82C).
Here is a picture of the evaporator installed on P4 motherboard. I was using a 3GHz P4 CPU here and it would clock to around 3.6-3.7GHz with good heatsink. W
Go easy on her, it's on my ISPs web space. Wait a minute, I'm still upset about not have truely unlimited access so on second thought: bag on it! ;)