Anyone stupid enough????
http://www.octools.com/articles/subm...ubmersion.html

[Ca$h68]

That is insane. Wow. I dont get it though.. he shells out a grand for some chemicals, but wont spend 50 bucks on a transmission cooler (complete with cooling fins like a radiator), and instaed starts bending pipes. ITs like purchasing no name tires for your ferrari. Blech.

Ca$h

[exa]

The bad part is, it does not work! Apparantely the Fluironite cannot withstand super low temperatures that the liquid nitrogen was bringing it down to... what a waste of 1000$+

[Zwilnik]

mad people, but from NZ, so what do you expect
They also didn't take into account that most components have a *minimum* operating temperature too. So cooling that lump of celery down to -1 degrees would probably do as much damage as just taking the fan off
Might be an interesting way to solve my noisy G3 problem though. Just immerse the whole thing in a tank of alchohol 8)

[reader50]

This thing did work, and would have kept working if they just used the test setup: full of ice cubes and about half full of icewater. The liquid nitrogen was very cool visually & literally, but it was just too cold.

If the flournite had not gelled, the board would have failed physically. Not much of a loss though - it was a PeeCee after all.
Cryogenic temps make most materials very brittle, and they were also setting up a terrific temperature differential from the inside of the CPU chip to the outside of the chip case. If they had kept going, it might have made a neat Quicktime movie of that Intel Celery chip shattering off the board.

Liquid immersion is used for high performance stuff. The Cray II supercomputer immersed all 4 processors. Since liquid does transfer heat better, Zwilnik is probably right that an immersed motherboard would not need a fan. But I would use the flourinite instead of alcohol. Alcohol often doesn't get along with plastics, and your chip cases are all plastic.

I have wondered sometimes if you could overclock safely by just sticking the CPU case inside a freezer compartment. It would look stupid as could be, with the cables slipping out the edge of the door, but would be a lot cheaper to test than this liquid nitrogen setup.

I still want to see their next photo article. As long as they pay for it (and their drinks), I will be happy to go on watching.

"I have wondered sometimes if you could overclock safely by just sticking the CPU case inside a freezer compartment"

That's a good Idea! (not that i'm going to try it on my G4 though )

[Ca$h68]

Thats a BAD idea. Condensation. thats why. Anyway, you guys all have valid points, but personally I'd go for the alcohol. Why? Well, even if it doesnt work, you can still drink yourself retarded, right?

Ca$h

[reader50]

hmmm... They got a 366 up to 650 before the cooling quit. A ratio of 1.77 to 1. If that ratio held up for a PowerPC chip, you could get a 500 up to at least 887 MHz.

Also...condensation forms on objects colder than the air temperature around them. In a frost-free fridge, the evaporator coils are always the coldest part of the system, and you only get condensation on other parts when the door is opened & lets in warmer air. You would have to seal the door with tape or something to prevent outside air leakage (because of the cables coming out), and you might need a warm CPU case to start with until the freezer can pull the air temp down below the CPU case temp. If the CPU were left off, you would need a light bulb or other heat source inside the case to keep the computer warmer than the rest of the freezer compartment. A circulation fan wouldn't hurt either. Trust me on this, I am a trained refrigeration/AC person.

BTW: I have NO plans to try this. You should always have a backup before trying something risky. I don't have a backup G4.

[exa]

I remember that someone had stuck computer internals in a fridge... they managed to OC a 33mhz 486 (?) to ~250mhz.. died like 10 minutes later, but was cool.

[The Godfather]

I remember I did an experiment kind of like that:

http://forums.macnn.com/cgi-bin/Foru...ML/000103.html

The Godfather