Taking the plunge :D
 

After many many emails to most of the academic staff at the uni it seems...
I have finally managed to do it, I have access to LN2 :D
Something I've wanted to do for ages, but just haven't been able to due to funds.
However, at 55p/litre, and with a 25l dewar I'm allowed to borrow for free, it just became possible :)
Any advice for a first timer?
Thinking of using eraser as insulation just because its what I've used before and its worked, tried liquid tape, and ended up with a dead mobo :( (using DI)

Looking at this for pouring?
http://www.houseofsher.com/item.asp?...&txtItem=11111

wow free :D

woooooo what board you freezing? pics man

link doesn't work....

i just use vaseline now :D....no more eraser...

sweet, thermo looks good too. Eraser ftw :thumbsup:

Does for me :/
Yeah, the chemistry department have a spare, which they said i can borrow if for short periods of time and given notice etc.
To begin with will be my i45, got an e6600, e2160, e4300 and e6300 here that I can get cold, all been done with my SS, but should still hopefully get some boints
Then I'm either getting some cedarmills and a p5b deluxe, or an i5 setup methinks.
Really pleased with the thermo find, i was thinking for a 1.8 I was going to have to spend 20ish, 12.50 ain't bad :D, although, if it does have a small neck, may look elsewhere.

i have flasks ..that i don't use anymore...i wonder if they fit the box from usps though.

as for eraser...ummm some parts get wet..you just have to increase eraser surface lol

I only use 4 of my erasers atm when benching with the SS, got another 2, so hopefully that should be enough.
How much would shipping be though? (on the flask)

Congrats on taking the plunge. What would be even sweeter is if they filed those things for ya.

Mm, slight hitch on the dewar
To borrow it from the department I need my 'supervisors' signature saying I'm authorised to borrow and will take care of it etc
However, as it's no for uni work, i don't have a supervisor...
Will be asking lecturers tomorrow if they are interested in what I plan to do, I'm sure one will be :P
If not, I'll just have to buy, been offered a 25l for 200 shipped, so guess I'll just have to do that.

Sweet. Good luck George.

Hey - good luck George :)

Don't forget that with LN2 there's more to the insulation of the mobo than just eraser. You'll have to find some 1/2 closed cell foam insulation and or course shop towels to protect your board from the cold. eraser is for the water.

Thanks
And I have some neoprene type stuff, and got a couple of cloths/towels, do i just wrap one around the pot kinda thing?
Been looking at some pics, but everyone seems to do it so differently, don't wanna kill another mobo on first attempt :P

one of my first mistake was ...backside insulation..or the lack of...

board got so wet at the back...you wouldn't recognice it LOL

it was my x58 board...from evga..it was called classified...lol

Mm, I normally have a layer of thin neoprene underneath for SS, might put a thicker layer aswell for LN2 :P

Right,
How much should I get for my first session?
Will only be dealing with s775 cpus to begin with, (e2160, e4300, e6300, e6600)
How quickly will i get through the cold stuff? I don't have to bench them all in one go, probably not possible actually due to time restraints.
Thanks

IF all you have a is 25L fill it up :)

How long would 25L last on dual core s775?

I will let the pros handle that. I would expect at least two chips though. Less on the conroes more on the allendales.

I meant in terms of time rather than chips
As I may have to have more than one session as I'm not sure for how long I can use the workshop area, and when its locked up etc
Getting LN2 is no probs, as long as its 5L at a time, don't have to pay del or anything, so 2 10 litre sessions is completely plausible in those terms.

10L will probably last you 6 hours (depending on your pour style) using those chips .

That is exactly what i'm looking for
Thankyou :)
Not sure when I will first be doing it, need to find out about the availability of the room, but once I've done these chips
Looking at a nice i5 setup ;)

+1

first check cb..so you can max the temps....
then check voltage scaling :D...i like to use brute force :D

Haha, I like that mentality.
You can't be scared to pump it up ;)
Am getting the paperwork for the dewar done tomorrow,
then find out exactly when I can use the room.
Then there's nothing that can stop me! (apart from money, and work :P)

Good luck and have fun! Best advise is to start your way up slow and OC at temps about -40 to -50c apart. I always run benches at diff temps when im pulling the pot down to sort of "break in" the system cold. -45c to -50c (single stage temps), -70 to -75c (DI temps), -100-120c (cascade temps) Then onto max temps teh system can handle. Going for broke at the onset almost always results in a bad session..

hehe I never imagined you being the slow and steady type. Especially as fast as you work when benching. :P

Its hard to resist sometimes believe me :thumbsup:, but that most definitely the best way to operate especially if your dealing with a piece of HW that has any kind of cold issue.

Thanks for the encouragement :)
Am popping down to a couple of supermarkets tonight, while I'm there I'll have a look for flasks, 1litre suitable?

Yes 1L will work fine :)

Good good, just got myself 1 for the moment
After kenny said he bought 2, but hardly ever uses it.
Can always pick up another if I find the need.

Well, finally managed to have a session
Not good at all
While I didn't kill anything, I couldn't get faster than my SS scores
I'm presuming a bad mount, although I remounted and it didn't change, not sure what I should have done to improve the mount tbh.
Temp sensor was too high up the pot methinks, as it would say -100, but the LN2 would boil off as soon as you poured it in, within seconds at times.
Then it decided that the temp was 20/21, and so just did the rest by keeping the same amount of LN2 in the pot, with no idea of temperature.
After giving up on the e6300 tried the e2160, and managed a slightly better cpu-z of 4410 rather than 4303.
Still, not a happy bunny
Plan to have another go on friday and maybe monday though,
Any tips, could really do with some help

hardware specs?
bios settings?

Board was an tpower i45
cpus were an e6300 and an e2160
2gb ddr2 ocz flex (capable of 1100+ CAS4)
850W silverstone psu
little devil cpu pot

Voltages ranged from 1.6-1.9 for vcore
1.4-1.5 for nb and fsb
2.3-2.4 for RAM

As far as I can remember
I couldn't even match the speeds I was getting on my SS :(

no temp reading?

what was the problems? bsods? freezes?

Well, as I said,
I reckon the probe was too high up the pot so to speak, as there were times when the LN2 would boil off within seconds of pouring, but the temp would read -100
And mainly freezes, although had some BSODs aswell, a lot of no boots.

im not sure but some intel e6xxx and e2xxx had low coldbugs...

600+ FSB is a nice feat no matter how you slice it.

Did you try dropping the CPU multi a couple of notches and see if it would push further? (On SS or LN2).

Oh and how are you cooling the NB? Stock? Air? NB pot?

Air, and I got nowhere near 600 fsb!
Have gotten the board to 560 before as far as I can remember
And no I didn't considering in general I couldn't even match the scores I'd got on SS

Sounds like you need a more accurate meter that reads below -100c before anyone can help you.

Mm, probably true, although it didn't seem to have any issues going down to around -120 when we filled the pot more, I think i defo need to move the probe nearer the base of the pot thats for certain.
Any ideas about the bad contact? I don't know what I can do, as I'm only using eraser with one layer of shop towel type material , with armaflex around the pot, so I don't understand why the base of the pot doesn't seem to be able to make proper contact with the cpu :/

Oh I thought it stopped reading at -100c. Probe placement and the temps you get off of them are relative. Probe/meter accuracy is the most important thing. Really George we need BIOS settings, temps, symptoms (which you gave some of) before we can help you. It sounds like a few times you might have hit CB.

No, i just used -100 as an example.
Right, well, I tried a range of voltages to try and get something to work
As said above, but for the e2160, which I had a little more success with:
vCore 1.8-1.9
vNB 1.4-1.5
vFSB 1.4-1.5
vPLL 1.6-1.8
Temps started in the -90 range, then we accidentally went to -100, and it didn't crash etc, and booted up fine, so we kept it there, and then went to around -110, again, didn't seem to have too many issues, but based on the poor contact, I'm sure the cpu was far far hotter than that.
It just clocked bad :P Again which is why i reckon it wasn't that cold due to poor contact, as i said, apart from getting a slightly better cpu-z, my SS clocked both chips better, and thats only in the -30s