Not sure that this is the place to ask this question, but here you go...
I was wondering about the whole process here, this is just to bench different chips to see how high they can go?
some chill the GPU also, but basically it's just for benching- right?
Yes only used for benching as it is dangerous in the wrong hands and only lasts a limited time, so yes just for benching
If you are referring to dry ice & liquid Nitrogen yes, it's main use here is for benching. If your not limiting the question to those cooling methods then it requires an entirely different answer.
It seems that the other cooling methods can be used in everyday use in one way or the other. Where as dry ice & liquid Nitrogen can not, obviously not a sustainable cooling method. Which brings me to my next question- how long can one bench per application? Does it depend on the size of the tube? or as they say, "Does size really matter"
As long as you want, you simply refill the container as needed.
As long as you want... providing you have a large supply of dry-ice or LN2.
You have to have a good supply of both correct, crush up the dry-ice and pour in some LN2. Or is there an equation to this?
No there is no equation. With dry-ice you can just leave plenty in and you will get temps down to about -78c. With LN2, you have to control how much you pour in... that is if you have a CPU with cold bug.
On average 1kg = 1 hour of DI, and you need to crush DI all the time
When I was benching yonah ratio was more like 1kg = 1.5 hours. Basically spent the whole day on DI, just refilled container every 30 minutes or so
Last edited by kiwi; 04-07-2007 at 03:02 PM.
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Also from what I have been told, it takes a little more heat to evaporate solid than liquid. So dry-ice needs a bit more heat to evaporate, LN2 will evaporate easier but you have more control over the base/CPU temperature.
@kiwi what do you mean- "yonah ratio"
For some reason I thought you use both, dry ice and LN2. But you use one or the other. Apparently the LN2 is the colder of the two. Is there a list of cpu's that have the cold bug? or is it a hit and miss proposition on each chip you bench?
You could always use liquid helium that goes down to around 4 kelvin.
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Dry-Ice = -78c (solid form)Originally Posted by dunway
LN2 = -196c (liquid form)
There is a list of coldbugged CPU's somewhere on these forums I remember seeing it. However almost every CPU is different... the same type of chip can coldbug at differnt temperatures.
Liquid Helium isn't really practical for home users... it's WAY too expensive because it takes so much energy to make even small amounts. Plus it would cost thousands for all the proper equipment to work with the stuff... the dewars often use LN2 to cool the walls of the Liquid Helium dewars. Also liquid helium is 4c warmer than absolte zero!
What do you use to melt the dry ice? I heard water isn't the right thing to use.
Dry-ice doesn't melt. It misses out the liquid state and evaporates straight in to gas form. When you add heat to dry-ice, it evaporates in to co2 gas.
Same with LN2, when you add heat it will evaporate in to nitrogen gas.
When a solid goes to a gas skipping the liquid phase thats called sublimation. you will see sublime used as the verb.
When the opposite happens when a gas goes directly to a solid thats called deposition. You guys see this process all the time too. When water vapor in the air forms frost directly without condensing that is deposition That happens when you passed the dew point and reached the frost point.
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????I forgot "you must"
Yea I was just kidding
3570K ● Asus V Gene ● 8GB Mushkin DDR3-2133 ● EVGA 660 Ti SC ● Seasonic X750 ● 128GB Samsung 830 SSD & External 1TB RAID1
SupremeFX SPDIF -> MHDT Constantine DAC -> Darkvoice 336i Tube Amplifier -> AKG K701
Thanks Walt.
Yea I was just kidding
It has been done before by IBM, they overclocked a silicone chip to 500GHz
lol thats awesome...maybe if I go to graduate school for engineering in like 10 years I'll do some overclocking
It has been done before by IBM, they overclocked a silicone chip to 500GHz
3570K ● Asus V Gene ● 8GB Mushkin DDR3-2133 ● EVGA 660 Ti SC ● Seasonic X750 ● 128GB Samsung 830 SSD & External 1TB RAID1
SupremeFX SPDIF -> MHDT Constantine DAC -> Darkvoice 336i Tube Amplifier -> AKG K701
You sure 500GHz? There are silicon/laser hybrid chips that can probably hit a couple hundred GHz but...
Lenovo Thinkpad X220 - Core i5 2410m, 4gb
waiting on 28nm video cards...
Yeah, it was to 500GHz with liquid helium, showing off SiGe IIRC....
Here is a link... although it is on plenty of other sites too.
http://news.bbc.co.uk/1/hi/technology/5099584.stm
By ratio I meant how long on average you can bench a chip with 1kg DI
...
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