LN2 by Christmas...mark my words!
 

What do you folks think about pouring LN2 outdoors in sub-zero temps.? I want to be able to crank the voltage through my memory, chipset, and everything and have it all stay nice and cool.

The purpose of all the fans is what exactly? I am all ears to all advice and teachings here. I want everything to go smoothly and I want to get a couple more WR....

I want to take out knopflerbruce at least once.:trophy: I'm sick of seeing his name at the top of all the lists I am on.

Thanks ahead for the help guys. :thumbsup:

For the record I have the F1EE, a torch(what kind of gas do I need again?), and a ceramic carafe to pour from. I have no idea how to go about it though.

Will these 939 chips even handle the cold......knopflerbruce and others used LN2 on them.

woot1

it only helps the colder you are ambient imo :D

I bench ln2 in my garage with the door open and its 25F out. Only thing is monitor leaves a bit of a trail behind my mouse :laughing:

idk about 939 but on am2 my 7750 BE CB was -15c rofl

You can use propane gas or Mapp gas for your torch. Mapp is hotter and makes a faster warm up form cold bugging. IDK about the ceramic carafe. I'd try and find a Stainless Steel one. Depends on the type of ceramic i guess. Some fans you see people use are for cooling things like mosfets or vregs on video cards or ram. Other fans you see are usually to keep the LN2 vapor from forming condensation. Usually when you pour LN2 if you don't have a fan sucking the vapor away from the board the vapor will fall on to the board or come out of the pot and just fall because it is heavier than air. That vapor is a condensation cloud. Cold air meeting warm air.

Nice explanation!
The carafe is plastic on the outside and like shiny silver thermos ceramic inside. It's from my last coffee pot.

So if outside, I probably don't need to worry too much about fans for cooling motherboard components....just mostly to blow/suck the vapor away.

Now I can plan the setup....since I didn't go to PO today and my new motherboard came in a day early. :blink: Who woulda thunk it...I bought it Thursday from a guy in Illinois.

I'm just worried about the glass inside breaking. I hope it can handle the temps.

Probably to be safe I should get a stainless one.......Maybe someone who has used a glass/ceramic thermos will chime in..........

Cheap crappy thermos style puring devices will evaporate your LN2 and frost up on the outside.

Colder ambients = less moisture in air = less condensate on board. :)

Fans hanging off the pot do both as der Dukemeister said already.

NOTE though. Fans can cool or warm devices depending on ambient. I prefer winter benching. Everything stays pretty frost free despite the 50-60C Delta (with DIce) with LN2.. you will get frost regardless but it will be a lot less I would assume (I LN2ed during the summer so...) I had more frost on my black and decker coffee cup (pour device) than my setup.

http://www.walmart.com/ip/Aladdin-2-...Steel/14968008

mine was like 15 bucks ;)

Tonight's the night. :) Going to get either 30 or 60 liters. I'll probably get 30 and see if that's enough to bench all my cpus tonight. Maybe get another 30 tomorrow if necessary to do my AM3 chips.

Please stay tuned for questions. I'll be back in a few hours. :cool3:

thermometer ?

Got it :) and I have plenty of kneaded erasers. What else before I leave?

EDIT: My pot doesn't have a hole for the probe. Do I need to drill one?

a vacuum flask...and a torch

Yah, need a small drill bit and drill out a temp probe hole nearest bottom of pot. Be carefull not to screw up the mounting surface by acccident!

I have a torch, just need gas.......and the best pour container I have is a really nice steel coffee thermos. Will this work? I'm sure not as good as a vacuum flask but I don't have to remove the lid to pour or should I?

Thanks that will be np.

I have until tomorrow night to prepare anyways. I talked to the owner on the phone and he thought they had LN2 but they did not. So they are going to get some tomorrow and drop off 30 liters at my house. The owner had his driver going to get just 30 and drop it off, but the driver said you can't because that little tank will be half empty by the time it gets to my house. So he's taking the big tank and then fill the 30 at my house tomorrow about 4-5pm. Which is better I suppose.

that would work how it is in the pic

Those thermos wil work perfect for you. For a first time user i think 30L might last you about 5 hrs of benching. Honestly i can go through 30L in about 2-3 hrs.
It goes fast so HAVE A PLAN.
Dukes Law with LN2: Just when you get to the point of knowing exactly what to do to get that score for high points you will run out of juice.

Couple of questions. Are you reenting the Dewar from them? Is it a presurized Dewer or just a storage Dewar that you will pour from.
My 35L non pressurized Dewar will hold full for about 2 weeks. I don't understand why he would say that. But thats cool that they will bring it and fill it right at your house for you.
My driver picks up my 230L Dewar on tues and drives around with it on the truck until Thursday when he gets into my area and changes out th empty tank. I probably loose about 25L in the transport process i think. idk for sure but there has to be some loss.

I think it's just a large mouth storage tank. I paid only $1 to rent it, but $1.50/liter.

Working out the plan between now and tomorrow afternoon. I may even get 2 boards ready for the pot.

I don't have to be in a big rush though do I? I can stretch it out all night and take my time between chips I hope.

No you dont have to worry about it evaporating fast. It dosn't evap fast at all when its not presurized. It takes about 2L just to get the pot down to temp though using a F1EE. Then theres the time and juice it takes to find your cold bug and CBB temps. Unless you just plan on going all out and worry about that when it hits. Are you just going to bench cpu's or Video cards too? If you're just doing cpu's you'lll have plenty of juice for a good time. Best of luck man. You're gonna have a blast.

I plan to just bench cpus I think. I have a 3700+, an FX-53 and 55, a 4200+, an Opty170 and 2 Opty154s(one I haven't even tried yet:D). Think I can get through 7 CPUs?

Would you say all these chips will have a CB at some point? What do I do then....break out the torch?

Check out the pour spout on this thermos. Should work great if the plastic can handle the cold. They each hold 1 quart.

How long before a quart is gone and I have to run down to the garage again? Do I just pour a little in or fill the pot up or what?

I'm going to ask a lot of questions because I don't want to end up frustrated instead of having fun.

I'm sure I could find out a lot of this just browsing, but I'd rather get important information from people I trust know what they are doing.

Thanks for your time brothers.:cool3:

Thres no way you will do all 2d tests with 7 cpus on 30L's bro lol. Pick 2 maybe 3. Fill the pot up slowly LN2 splashes so BE CAREFUL and don't get it in your eyes or on yourself. It burns. and if you can get the Dewar up to where your benching that would be good. You'll be doing alot of running. Like i said before it will take about 2 litrs to get your cpu to around -130. You will fill your pot about 4 times to get there. Depending on how much voltage you're putting into the cpu. Are you tweaking in windows or just in the bios? Better get used to the frustration bro...it coms with the territory. even seasoned benchers get frustrated. lol

cold bug example: If all of a sudden as you're pouring your mouse freezes up and dosnt respond at say for example at -130 but you still have a windows screen you've cold bugged. Then its time to turn off the pc manually. (I like to use the motherboard power switch when i can and not the psu power switch because i dont have to go back into the bios that way) break out the torch and start warming it up. Try restarting it at -100. If it dosn't boot get it to around -90. keep Trying to restart it as you get warmer. It will finaly start back up eventually. Lets say it starts up at -80. This is your cold bug boot temp. Now you know that you can't get colder than -130 and chip has to be at-80 for a restart. Keep a record of the cold bug and cold bug boot temps that way you will know exactly where your temps have to be. Almost every chip is different. Som don't cold bug at al and others cold bug at-80. Its always a mystery with a new chip.

OK. :blush: I'm only doing 6 of 7 tests unless I can download pcmark05 somewhere. Doing some figuring beforehand will make it easier to figure out FSB/multis for each chip. I'm doing a little tweaking in Windows, just stopping things that use memory. I'm overclocking in BIOS and then via software above a certain point. Do you suggest increasing the voltage a little at a time or just give it 1.8+ and go for it? And I thought keeping it outside would be a good idea for preservation sake, but if it won't make shit for difference then I'll carry it right upstairs.

Has anyone ever tried using a heatgun instead of a torch?

id rather remove that plastic cover...

edit..lol ninja posts

Heatgun wont do it. It would be to slow and you'll lose alot of time. and i agree with HC that pouring spout will most likely get frosted and clog up.
Keeping LN2 outside wont make a difference at all.

lmao ya Ninja posting.

Ok that makes life easier. I'll bring the 30 right upstairs and have two 1 liter thermoses to use so I'll have to open and pour less often. I need to get a nice funnel for pouring into the thermos.

EDIT: when it gets too cold, point the torch right in the pot huh?

Yup aim for the bottom. I tried a funnel once..it didnt work out for me. I think you'll find pouring right into the thermos will be easier. But everyones different. What ever works for you.

you can boot the pc with the pot mounted or not.

observe the pot while empty. its boring its not moving lol

splash or pour ln2 just a spoonful observe.

then observe some more...then pour some more....

if it freezes you've found a bug...a cold bug. note it down.

don't torch when it cold bugs. observe. maybe its gone after a few temp increase.

take note of frost buildup...if they build up and melt..its a puddle of water.

this is just 0.05% of my experience lol

Plz dont confuse him.

I understand what both of you are saying and how they can go hand in hand. I must exercise patience, and have lots of towels on hand for when I do need to torch, but I don't want to torch unnecessarily.

if your benching newer amd stuff, get the pot the -190 and enjoy no cb or cbb.

I'm saving the new stuff for another day, but the info is certainly welcomed. I'm going to do as many of my 939 cpus as I can get to this time. More points. :thumbsup:

EDIT: the list includes a 4200+, Opty152, Opty170, and hopefully get the FX-55 and 3700+ done too. It's all going to go very smoothly you see. So many WRs your heads will spin.;) Probably not, but hopefully a few more silvers.

Ugghhh...22 iterations in to superpi32M I get not exact in round....the cpu is weak. I have to go to bed it's 2 am. Probably be up later tomorrow night hopefully.:)

I would not use that thermos. They are glass lined , and if pouring coffee into one can cause swelling and glass shattering, I cant imagine what a massive temp swing like LN2 would do.

I love them thermoses but they are fragile.

Neither of the thermoses are glass lined. They are steel inside and out I'm pretty sure....or at least they look steel inside and sound like steel when I drop something in.

i don't think they're steel..heehhe but rather aluminum.

They are old and steel and are glass lined. I had one too. Poured in a pot of coffee one winter day and SHATTER.

I am referring to the green stanley brand one. I do not know about the other.

I can see the seam where the metal is joined/welded up the side of the interior of the Stanley thermos. I'm pretty positive it is not glass....perhaps you had a different one. Thanks for the warning just the same.;)

I use that green stanley one every session, carry on with confidence.

I got the stuff :cool3:

Insulation is done, some fans are setup, probe hole is drilled and probe installed, I have the BernzOmatic fatboy full of Map gas.

I think I'm ready to actually mount the pot.

Last minute advice?:blush:

use ceramique...

warm the pot to 30-40c...apply ceramique on the pot...so its soft like butter...

then mount on the cpu...