liquid helium cooling?

[wr0x2]

Is it even feasible, or is there not much benefit going below the temps of LN2?

[Charles Wirth]

Welcome to XtremeSystems!

It is much colder but harder to work with and obtain in the liquid form.

I have a Helium scroll compressor that was put on the back burner.

[bh2k]

I heard your cpu can't operate at a temp that low, plus fugger is right, it's really hard to get. I tryed to get some and they asked if I had a license.

[saratoga]

Generally silicon will not work as a semiconductor at those temperatures (it becomes an insulator without a minimum of thermal energy to promote valance electrons to the conduction band). However AMD and Intel do some weird stuff to the silicon they use in order to boost performance and decrease energy use, so I really don't know what would happen.

I wouldn't be surprised if the chip simply did not boot though until you let it warm up a little.

[saaya]

well afaik the old P4's and P3's and athlons dont care about very low temps, but the newer cpus wont boot or will crash below -140C.

[wr0x2]

Wouldn't that mean that you couldn't use ln2?

[bh2k]

In theory yes, but it's not truely -192C it hovers somewhere around -120-90C to be about right.

[MailmaN87]

I have been wondering abaut the same thing, since I was reading abaut it in my chemical book

[Hilppa]

Sorry but you are wrong

LN2 really evaporates at ~-196, depending on the air pressure. It really hovers around -194 .. -198 celcius. If you shut down your computer, and it's well insulated, the bottom of the tube should be around -196 celcius after you pour it full of LN2. If your computer is on, and processor is making heat, naturally it won't go as low as -196.

If you claim that liquid nitrogen evaporates as -90 ... -120 C, or that it's the lowest baseplate temp achievable with LN2, you have a crappy thermometer



My baseplate temps measured with that thermometer, it's LN2 in the cup

[CodeRed]

One of the many problems with liquid He is the latent heat of vapourisation is only 2.56 kJ/litre. At a load of 200W you'll consume approx 4.7litres/minute. Thats one expensive overclock

here a link with some comparitive data
http://www.lancs.ac.uk/postgrad/grif...yoliquids.html

[JSU]

Sorry but you are wrong

LN2 really evaporates at ~-196, depending on the air pressure. It really hovers around -194 .. -198 celcius. If you shut down your computer, and it's well insulated, the bottom of the tube should be around -196 celcius after you pour it full of LN2. If your computer is on, and processor is making heat, naturally it won't go as low as -196.

If you claim that liquid nitrogen evaporates as -90 ... -120 C, or that it's the lowest baseplate temp achievable with LN2, you have a crappy thermometer



My baseplate temps measured with that thermometer, it's LN2 in the cup

I think he means core temps....

[moosturdsoed25]

i had always thought CPUs shut down at -178C and some VPUs and -128C or something, please correct me, experiences members...

[chilly1]

In Las Vegas Ln2 boils at -350F or -212C

[SlackeR]

need a bit of work for that

[quintus]

In Las Vegas Ln2 boils at -350F or -212C

y?
atmospheric presure???

[Kanati]

It seems to me that they could make a cpu out of a superconductor so that the xtreme temps of liquid He2 could be put to good use.

[SlackeR]

y?
atmospheric presure???

as i wrote, need a bit of work for that
he is pumping it wih a vacuumpump, so it boils at lower temp.
look at the topic he made about it..

[johnny m]

Help, Help!!

Have been doing lots of LN2 project the past 4weeks with many different boards and the QX9650. I have a question if anyone can answer it for me.

with my tube correctly mounted on the processor filled with LN2 if I let it sit there for awhile then try to boot the board starts then shuts down. we have insulated, rigged little electric coils around all the caps near the socket and have followed pretty much all the standards for LN2
maximux extreme
QX9650
corsair 1800 DDR3
1200watt thermaltake
2 3870 x2's

[Polizei]

Three and a half years since the last post in this thread... Impressive.

You probably have it too cold. Take the LN2 out of the tube, let the processor warm up, then put some back in the tube. It wont boot colder than -140 or so.

[wr0x2]

Dude, come on. I'm not going to ask how far back you had to look to find this thread, but what made you think that your post was even remotely relevant?

[tiborrr]

Liquid helium isn't usefull since you have to consider the superconductivity effect. Most metal & metal alloys becomes superconductive at around -205 ~ -210°C, some ceramic materials already at -170°C. Not to mention helium has a very very poor thermal conductivity, far worse than that of LN2 (and even nitrogen's therm. conducitivy sucks compared to water).

Therefore, no good use for helium in computer overclocking.

[Fujimitsu]

Liquid helium isn't usefull since you have to consider the superconductivity effect. Most metal & metal alloys becomes superconductive at around -205 ~ -210°C, some ceramic materials already at -170°C. Not to mention helium has a very very poor thermal conductivity, far worse than that of LN2 (and even nitrogen's therm. conducitivy sucks compared to water).

Therefore, no good use for helium in computer overclocking.

True.


Excellent zombie thread by the way.

Polizei is probably right. The chip will not boot at that low of a temp. Do as he said and see if it works.

There are lots of ways to control temps, it just takes practice. Once you find roughly the low limit of what your CPU will boot at, you can use your thermometer and a bit of creativity to keep from going below it.

[johnny m]

If you don't mind me asking, what are some of these ways. Sorry to sound like a newby but I am with the LN2. I tried a little water to make a small block of ice on the bottom of the tube. This didn't do much good though.
thanks....

[Fujimitsu]

If you don't mind me asking, what are some of these ways. Sorry to sound like a newby but I am with the LN2. I tried a little water to make a small block of ice on the bottom of the tube. This didn't do much good though.
thanks....

The ice thing works, as would controlling the amount of LN2 you pour in.

Might wait for some more experienced ln2 overclockers to chime in, maybe they have some secrets for you.