What I learned from AirGas today :)

IF you bring in your own dewer, the charge works out to 5/6 USD per liter because they first have to chill down the unit and that wastes product ... umm sure..

HOWEVER... you can RENT a 180 LITER DEWER for about $2 per day (60/mo) and then the LN2 only costs you $1 buck a liter. Since they weigh 5 or 600 pounds, they need to be delivered ($27 approx in my case) but they won't go up or down stairs. This would work for me since I have a gated back yard with a sidewalk that runs just next to my current office, and, my fuure basement laboratory..:morpheus: All I'd need to do is drill a hole into the house and run an insulated tube down (the wife already has rejected any thoughts of LN2 in the office) to the basement and I'm set :)

Seems like the best solution :) If 180 liters lasted me two months the cost would be about $240, or, $4 per day :) :)

Ohhh, can't wait for my daughter to move out lol

So the 180L dewar comes with a withdrawl device?
"Running an insulated" tube might become alot harder then you think.

And this is 100% the case, you bring in a room temp dewar it can take more then a few liters to chill it down.
Normally it's about 15% of carrying capacity (A 100L dewar might take 15L to chill)
And they charge you by the size of your dewar, so they're loosing quite a bit of money there.

Actaully, they didn't mention a tapping device, and I already suspected running an insulated pipe may be more difficult than one might first imagine... but I've attempted far more ludicrous endeavors in my time, and somehow have always pulled them off.

Just a matter of boring through the concrete wall of the raised basement.. should be no big deal lol

They're delivered already full and they'll wheel them into place ready to go. Sounds like a hell of a deal to me bro :)

It is a good idea. But moving a cryogenic liquid that evaporates and builds pressures isn't so easy. Withdrawl devices can cost MORE then the dewar.

If you are going to run a hose from the dewar into the house make sure you put a pressure releif device between the dewar and the valve inside.

Dewar has one already, wouldn't worry that one too much. More the better though?

As long as he is not trapping any LN2 between the valve on the dewar and the valve inside he should fine.

Couldn't I just leave the valve outside on all the time and turn it off with the vavle inside?? Would be a royal PITA if I had to walk outside and around to the side of the house to turn it on and off each time I wanted to use it. Or would that cause it to dissipate too quickly?

So how much colder can LN2 bring the CPU as compared to a good Cascade unit ? Sounding more and more that the cascade might be the way to go if -110C is low enough.

Also.. is an LN2 run a one person or multi person effort? What if you want to do both cpu and gpu pots ??

Really like the idea of LN2 but the wife gave me anouther reminder today I can't do it unitl I get my basement back. In this economy, who knows when that will be :(

If you're running a cpu and a couple of gpu pots, you'll want some help doing it. But if its just you, its doable but a major multi-task if you're really riding the edge of tuning temps/clocks. For bone crushing pump up the voltage overclocking, you can pretty much run LN2 on the 1's and 2's like a mad man and see major overclocking gains.

Well you can go as low as -196c max on ln2, but most chips except PHII can't take it. The few i7 that can are reported to get funny with the IMC. Honestly a cascade is cold enough for i7, but you don't get the temp control like with ln2. That is what makes it king. Got a CPU that cold bugs at -40? No problem, use ln2. Cold bug at -62c? Use ln2 cause dice don't give temp control. Get it?