LN2 questions

[Dimdirol]

Hi all,
I'm going to cool my cpu with LN2. Unfortunately I have no chance to get copper, so I'll use aluminium. At the moment I have a baseplate:
http://www.topmods.net/base.jpg

and a tube.
So, what do you think about it? How many degrees I'll loose because of the aluminium?

Also I found a kind of dielectric grease(Silicone):
http://www.topmods.net/silicone.jpg

What can you say about this? Can I use it for insulating?
And one more question: is it necessary to put dielectric grease to the socket?

I'm going to try all this on my old 1400 Thunderbird and Chaintech 7VJDA (KT266A) :)

[bh2k]

When your that low the difference between All and copper is not even really noticed. Your baseplate and and tube will work fine, and you just have to make sure that the silicone is 100% non conductive, if it is conductive it will short the board out, but other then that it should be fine. Finally, yes you should put dielectric grease in the socket to avoid condensation on the pins.

[saaya]

hmmm id recommend vaseline :D

at low degrees it gets harder and more creamy and doesnt move anymore, a bit like peanut butter.

and its easier to clean off than silicone imo. all you need is to put the board upside down and blow some warm (warm, not hot!) air on it and the vaseline will become liquid enough and run down the board after 1 or two days. then some brushing and some electronics cleaning spray and its all gone :)

i used bathroom siliocne to insulate before, and it works great, but its a pita to remove, almost impossible to get it all off...

[Dimdirol]

This silicone is 100% non-conductive. It is a dielectric grease, based on silicone.

saaya, I'll try it, because vaseline is much cheaper than silicone, and if I can clean it off easily as you told me - it's the best solution :D

[bh2k]

Any kind of grease is annoying to really clean off.

[saaya]

yes, but if you patient and have the time vaseline is great because it becomes very liquid at 40C already.

if you blow warm air on it for some hours most of the vaseline will melt and run down the board like candlewax.

and the rest can be removed easily with an electronics cleaning spray and you dont need much of the spray :)

and you dont need to remove all of the grease, if theres some vaseline left it will just look like you smeared a little butter on your hardware :D and it will protect your board when you acciently spill water on it as theres still a thin layer of the vaseline.

[Dimdirol]

...mmm finally I've failed to solder the baseplate and a tube.
http://www.topmods.net/misc/failed2solder.jpg

http://www.topmods.net/misc/failed2solder2.jpg

I've failed because of the baseplate. It wasn't actually made of clear aluminium, there were some other metals, so everything went wrong.

Fortunately I found some copper and made a this one:
http://www.topmods.net/misc/LN2b1.jpg

But here is also one problem: baseplate is too thin - 1mm. Is it fine? And what problems I'm gonna meet with because of this?

[lalPOOO]

You will experience rapidly changing temperatures, because theres nothing to 'hold the cold'. The instability in temperature may cause problems...

[sang]

yeah,even 6 mm base its still thin.Ive used 2 cpu containers (CU).Only the 2nd,with 13mm thickness was capable to keep my barton M under -130 C.The first one was a failure.I had to keep filling the container with ln2 continuously,and my temps were far from stable.
Another sugestion its to make the pipe pretty thiner.1mm its ok.Otherwise,the cold temps generated by ln2 will tend to spread over the whole container.U just need to keep only the base colder as u can.

[Dimdirol]

Hi, it's me again :)
I've had 3 LN2 sessions, but I had no time to write. Here are some photos:
http://www.topmods.net/misc/LN2working.jpg
http://www.topmods.net/misc/5.jpg
http://www.topmods.net/misc/2.jpg
http://www.topmods.net/misc/3.jpg
http://www.topmods.net/misc/6.jpg

My first result is: AMD Tbird 1400@1300 mhz (downclocking with LN2 :D)
Second: failed
Third: AMD Tbird 1400@1760mhz

I reached 1760 mhz quite easyly, but my Mobo freezed again and now I'm looking for another one. In January I'm going to improve my results.
P.S. I like LN2 it's so cool :D
P.P.S. Also I tried Duron 750 (last photo)

[Firefoxx]

ermm.. I can't see Insulation, lol?!? Didn't u use?

[Russell_hq]

why dont u guys use plastic or stainless steel pipes? they are much poorer conductors of heat and all you need to do is glue it to the base as you are not holding any sort of pressure. Maybe worth a try?

[Dimdirol]

Firefoxx
ermm.. I can't see Insulation, lol?!? Didn't u use? I've used vaseline, as saaya said. :D
Russell_hq
why dont u guys use plastic or stainless steel pipes? Because I still can't find copper baseplate :D In January I'll show you a device made of plastic (not all device of course)
First reason of using plastic is
they are much poorer conductors of heat and all you need to do is glue it to the base as you are not holding any sort of pressure.
Second one - I like modding :) Gonna do something interesting.

[Dimdirol]

http://www.topmods.net/misc/sprite.jpg

I put some Sprite into LN2 and got an icicle... tasty icicle :D Next time I'll put C2H5OH

[Aphex_Tom_9]

so. with liquid nitrogen at -196c...you gained 360 mhz...after first losing 100...
that's some odd results

[Dimdirol]

Aphex_Tom_9
so. with liquid nitrogen at -196c...you gained 360 mhz...after first losing 100...
that's some odd results It's all because of MoBo after some time it freezes, that's why I'm looking for another MoBo to continue my experiments. Now I have MSI K7N2, but it has no mounting holes near socket :(

[Aphex_Tom_9]

Aphex_Tom_9 It's all because of MoBo after some time it freezes, that's why I'm looking for another MoBo to continue my experiments. Now I have MSI K7N2, but it has no mounting holes near socket :(
ahh, i see now. i saw the nf7 box at first, then realized it's something else. oh well.

[Dimdirol]

Aphex_Tom_9
ahh, i see now. i saw the nf7 box at first, then realized it's something else. oh well. Yes, it's just NF7 box, MoBo on photos is Chaintech 7VJDA(KT266A)

[lalPOOO]

why dont u guys use plastic or stainless steel pipes? they are much poorer conductors of heat and all you need to do is glue it to the base as you are not holding any sort of pressure. Maybe worth a try?

If the 2 different materials expand and contract at different rates during the cooldown or warmup the glue will crack.

[Unknown_road]

probably every plastic will crack at those temps :D stainless tube is possible but doesn't contribute a thing.

glueing is a very bad idea, I think you will get a big leak and ln2 every were.

@TS: what did you use for alu brazing?

[PytonOrm]

mine dry ice / ln2 container :D

http://w1.565.telia.com/~u56506172/PICT0002.JPG

[Dimdirol]

Unknown_road
probably every plastic will crack at those temps I don't think so, look at this photo:
http://www.topmods.net/misc/LN2glass.jpg

It's a plastic glass filled with LN2. I also supposed it to crack, but as you can see it's Ok. Of course, there are different kinds of plastic, and some of them will fail at these temps, but I should try :)

[PytonOrm]

:mad: get some insulation man !!! just like me :) you gain some extra degress on cpu too... :D Merry Christmas all !!!!!!!! from sweden

[Hilppa]

It only takes a bit longer to get the tube cold if it has thick wall's made of copper for example. After you get it cold, (and if it's well insulated!!), it doesn't affect the coldness of the baseplate. And you guy's really need to start insulating, only using grease in the socket is not enough. The caps on your board will freeze and your vcore will start fluctating, not to mention the condensation water forming on your mobo. Better get some plastic spray on it also.