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post #7201 of 7327
Id say you'd want the lowest pressure possible.
post #7202 of 7327
Quote:
Originally Posted by Red5 View Post

Hey guys. General LN2 question, I hope this is the right spot to ask.

I've done some CPU LN2 benching previously but am soon going to be doing CPU and GPU together. I have read this requires a lot of LN2 so I have been researching renting a tank from Airgas, probably 180L.

My question is that I see they come in many different pressures (22psi, 35psi, 50psi, 230psi) and I'm not sure which would be ideal. I will be dispensing LN2 from the large tank into a 10L dewar, then to thermoses for pouring. I assume that I want the lowest pressure possible for my uses, so the 22psi but I haven't dealt with the larger tanks in the past and any advice would be great.

Also, I noticed they come in grades (food grade, medical grade) and I assume I should just get whichever option would be cheapest, is this the right thinking?

Thanks in advance!

I think CAxVIPER is making a good point. The big 180L sounds nice, but depending on how quickly you use it, a lot will go to waste. A cpu and gpu can use a lot of ln2 or not that much. It really depends on the hardware being used, how well the session is going, what benches you plan on running. It's good to have experience with the hardware, know it's limits. Then you can pretty much go straight to knocking down them scores. I used to try and run as many benches as I could during the session and I never really got good scores. When I focused on one bench only and then shut stuff down when i was content, I got good scores and had more ln2 for the next day.

I've gone through 50L, in a few hours and sometimes it's lasted me a week or two. Transferring from a big tank to a small 10L, I'd imagine a lot would go to waste and the tank sitting for long periods of time will waste a lot too.
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post #7203 of 7327
This got delivered yesterday:


And potentially picking up a CPU and GPU pot next week along with a LGA775 board, so will hopefully mean some sub zero benching finally!

It's a 35L and I assumed it'd be fine for a session or two if just using a CPU pot?
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post #7204 of 7327
You shouldn't have an issue with that. Out of 1 30L just doing CPU i've gotten 8-10 hours worth of benching. Of course that will vary on what CPU it is.
post #7205 of 7327
Thanks for everyone's responses. I'm going to take your advice into account and get quotes on some smaller dewars when I talk to airgas. I'm also gonna talk to the praxair where i get my 10L filled to see if they have dewars for rent. They seem like a smaller operation so I didn't think they'd have a big tank to rent.

The first pair I'm going to be cooling is a phenom ii 955 BE and a 780ti classified KPE. I know the cpu is old and it's not a good pair but it's what I have to work with at the moment. It's more about getting experience cooling a cpu and gpu together and I want to see how far I can push the KPE core since it's designed for LN2.
post #7206 of 7327
Quote:
Originally Posted by Red5 View Post

Thanks for everyone's responses. I'm going to take your advice into account and get quotes on some smaller dewars when I talk to airgas. I'm also gonna talk to the praxair where i get my 10L filled to see if they have dewars for rent. They seem like a smaller operation so I didn't think they'd have a big tank to rent.

The first pair I'm going to be cooling is a phenom ii 955 BE and a 780ti classified KPE. I know the cpu is old and it's not a good pair but it's what I have to work with at the moment. It's more about getting experience cooling a cpu and gpu together and I want to see how far I can push the KPE core since it's designed for LN2.

PraxAir and Airgas are both nation wide gas distributors. Tell them you want to open an account and you will be buying some large amount a year and they can normally get you a much better price.
post #7207 of 7327
Quote:
Originally Posted by CAxVIPER View Post

PraxAir and Airgas are both nation wide gas distributors. Tell them you want to open an account and you will be buying some large amount a year and they can normally get you a much better price.

Thanks for the advice. I'm currently going through the process of setting up an account with Airgas, so I should be able to get some quotes soon.
post #7208 of 7327
Quote:
Originally Posted by Red5 View Post

Thanks for the advice. I'm currently going through the process of setting up an account with Airgas, so I should be able to get some quotes soon.

If there is a matheson tri-gas you might also check with them. That is who I use and I'm paying like 0.80/L
post #7209 of 7327
Quote:
Originally Posted by Red5 View Post

Thanks for the advice. I'm currently going through the process of setting up an account with Airgas, so I should be able to get some quotes soon.
Try South Jersey Welding and Supply.
    
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post #7210 of 7327
Quote:
Originally Posted by CAxVIPER View Post

If there is a matheson tri-gas you might also check with them. That is who I use and I'm paying like 0.80/L

I also use matheson, $0.56/L
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