Wow that's way higher than I expected.....I was just looking at one.

How much does it cost to keep a good supply of LN2 around?

Well, you prolly coulda picked up a 35L dewar with the money spent on this chiller but I'm not pointing fingers or anything :taunt:

Need to check your local airgas, gaspro, or other gas supplier in the area, call them, they give quotes on ln2 by the liter prices quick and easy. Prices vary from place to place.

A decent dewar will hold Ln2 for about a month. 35L should hold you down for a good amount of sessions as you start out.


They also rent out dewars, check prices on that too. OR, drift thru e-bay for a cheap one.

Yeah but I like my chiller machine. :blush:

I'll call Chenango Welding Supply tomorrow. Thanks for the info dude!

OK I'm back with an update:thumbsup:

First thing this morning my pump quit pumping, so I went back to the submersible(not submersed). And since I had the chiller drained already, I decided to take apart and clean the waterblock which actually had some deep down shit right in the center that I never cleaned out before today. It took a lot of work to get it out. :eek:

And since I had the block apart I broke out the grinder again and put 4 more channels in between the first 4 you see in the picture.

Then I decided to use the cheap Radio Shack silicone to try for a thinner layer. The AS Ceramique always ends up too thick it seems.

So the combination of all that stuff has netted me a nice improvement...even with the addition of the single GPU loop making a single pass through the chiller.

Right now the temps are better with the coolant @ -30 C, than they ever have been @ -40 or below. The temps are steadier and the coolant stays cold longer, with this slower pump, and the cleaning, and the additional modifications...ohh and thinner TIM.

I'm extremely pleased with it finally. I may try for 5Ghz again in the AM.

My repositioned probe on the block says 7 F, which is ~ -13.8 C.....lol Windows programs say 3 C, BIOS program says 0 C. :Dizzy:

Nice work bro, never give up never surrender! :hammered2:

Dude with the coolant at -30.......the chiller can almost keep up with the heat from 4.5GHz/1.5v with the GPU loop in there.

In a 1/2 hour @ idle the coolant temp has risen less than 1/2 a degree. .....in fact I'm not even sure it has risen.....ahhhh I don't think it's gone up. It's hard to tell looking @ this regular outdoor thermometer.

Yessssssssss, I am so happy. 4.5GHz sub-zero racing. Everything seems better sub-zero. :) Gonna let it idle for another hour just to be sure.

QFT! :cool3:

OK it's OFFICIAL now!

I accidentally left the pump running all night, which not only limited the cooling ability of the chiller by a few degrees, it also caused a bunch of unnecessary condensation. So I broke it down and made sure nothing was wet before I started up.

The chiller cooled down another 3-4 C while I was working on the block. The block is 3-4 F right now @ 4.5GHz/1.5v......which is way sub-zero in Celsius. :cool3:

EDIT: all zeros picture added :thumbsup: Goal reached.

Sorry about the picture size, I think on a larger monitor than I have you could easily read the zeros.

You run thru all the benches now buddy?

Sweet chiller bro.

Just want to chime in on the making your own LN2 question.

There have been some retail attempts at home LN2 making setups.

Problems:
1) They make it too slow to be very useful for our purposes. 1L/day doesn't cut the mustard when you consider that the stuff is evaporating while you're trying to make and save it.
2) Still expensive.
3) The energy costs of running it all day to make your 1L of LN2 cost more than buying 1 L of LN2.

Same problem with getting a big CO2 cylinder and making your own DICE. Still much cheaper to just buy the DICE.