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Depends on size of the tank and the rig. The waste heat from the rig is going to be your biggest problem.  The tanks water needs to stay constant temp or you run the risk of killing the fish.

my first thought was : poor fish....:>

Aquarium is  a form of describing the oil cooling, which has proven valid because of engine.

People, especially in cloud service, keep asking how to throw the air conditioners away as I need 300U to cool the 150U. An engineer, who has introduced his diesel engine, using water,air and oil to maintain the working temperture, this ensure safety and quiet( over than 60dB can be problem) . I have heard puget system has introduced one, that is called aquarium workstation (as their v4 can handle the Di-xeon configuration) ; Intel has been testing but in industial dyeing pool for years on xeon series, and some server supplier provide the solution, really in dyeing pool in order to increase the density of the array, keep the environment reasonable as noise problem is found more than on street due to reflection and repeatable pattern generated by fan even air condtioned.

Currently, water cooling is not the perfect solution,For safety and practical reason,  You will need to use oil-water-air (found on your 2 liter engine) to solve the problem as rig is precious and critical.

The design can put more array in the 150U space if you dare, with the configuration, it is possible to put 275U in the same space.

One more thing, there is no fish in the rig as the rig will be covered by mineral oil. It is for amusement or for saving precious space.

Additionally, I have posted a more practical draft to address how to build bigger array while still keep quiet, keep safe and Reducing the cooling cost. Mineral oil is more applicable for as the equipment is specfic for one purpose, calculating the hash for money. If general? Then use special block to load mineral oil instead of dip in the oil.

Oh, there's one more thing, the waste heat... Radiator known can solve the problem by transfer the heat to air via the being.

P.S high voltage system(For example, 25KV found on evelator system) also need oil to maintain the working environment

It's a pretty cool concept.  I had never heard of doing this until a week or so ago I was looking for "liquid cooling" and stumbled into this.

Searching for Mineral Oil Cooling will give you some neat pictures on Google Images: https://www.google.com/search?q=cooling+pc+with+mineral+oil&um=1&ie=UTF-8&hl=en&tbm=isch (https://www.google.com/search?q=cooling+pc+with+mineral+oil&um=1&ie=UTF-8&hl=en&tbm=isch)

The aquarium is just a container, the concept is oil cooling, which provides,
Safe and slowly function, which has been using for a century at least.

The concept, 5 years ago, with different demonstration. If trace, three years ago, with eu language.also Intel herself.

Look awesome  :)

http://www.youtube.com/watch?v=Z_X_hgtlJpA&list=FLD9ByTEqibFo8HgkHkry2qg

I planned to do it but I gave up because the hardware related to the tank & cooling & mineral oil is way too much expensive.

But maybe I will do it if I ROI with my previous mining rig and investment.

You are wrong. Oil cooling is proven method. Start from vegetable oil. Then you will know why it is practical.

Talkers on web, suggest to use vegetable oil or Johnson baby oil instead of that, Intel also does.

You meant that I am wrong to think that I can only use expensive mineral oil which is expensive right ?

I doesn't change the fact that you have to cool the oil (especially with mining rig) with a water pump and fan system and that is expensive.

You didn't look at my video. They use a passive cooling system but I agree the liquid they use is probably expensive (not mineral oil).

Yes it is. Just slightly bad but easy to find, price tag is friendly. However the pump and radiator is the thing, but if, comsidering the operational cost, it is more reasonable than normal ones. Think about why the glass-fibre bus is more reasonable on operational cost but not in the initial cost.

I had 83 7950s air cooled no aircon ambient temps of over 25c  and the cards were still sitting cool :)

water cooling is good reliable and nearly silent

oil cooling is messy runs hotter and voids the warenty

I haven't seen the video sorry. This is very interesting indeed.

Can someone estimate the price for a full tank of Novec™ 7000 ?

The website say :
Please call 1-800-810-8513 to locate a sales representative near you for technical assistance, sample requests, or to schedule a trial.

The price must be so chocking that they hide the information.

someone I know was quoted over £1000 to fill a small fishtank that had 1 rig in it 

Well, not only puget, even some service provider (I have little idea of the speaking but with 'oleju' :oil in english), the people laugh, but they relise the emotion is completely wrong afterwards , mentioning in oil, they don't use vegetable oil but some medical use oil labeled as baby oil.

The concept I have found , before I post, I have to trace the needed including diesel engine. The half-2-4-1 may be the typical method to maintain the engine operational even with no diesel in.

looks like I have found, mainly in polish. I think puget is a serious tester like intel.

1. http://m.youtube.com/watch?v=ik2Uo3c98zk (polish)
2. http://m.youtube.com/watch?v=SJUbCGvWO4A (polish)
3. http://m.youtube.com/watch?v=5qQsOmOTFKg (Only little idea, mainly in polish as at last, it mentions company made, packaging the oil PC into scary story(experiment , I just have noticed the pronounciation , demonstrating start from stop to make me comfortable as most video I have watched , filled Live)
4.http://m.youtube.com/watch?v=Eub39NaC4rc&feature=related , alterative solution for oil. Johnson baby oil or the related should be.
5. Company talk, SSKN 2010, http://m.youtube.com/watch?v=HVKWRBBEers&feature=related, the uploader himself has introduced the idea to reduce the cooling cost while providing better service for clients. There will be no laugher anymore, we shall see in future as if temperture differance is too big, then this will be problem.
6. demostration with vegetable oil, http://m.youtube.com/watch?feature=related&v=hbOZbSl-14k&rdm=ufvfz6td&gl=HK&hl=zh_TW&guid=&client=mv-google

Also puget and intel should be, too .


Note that if you like to transform the oil from liquid into stream, You will need 473K to do. Flammable can reach that faster so if you pour gasoline, or diesel in your rig, the rig will be wasted.


There are many samples found on youtube, use oil PC or komouter w oleju ( or something like this, it means computer in oil, polish)

PERHAPS, normally liquid cooling voids the warrenty. But there is something wrong in their talk, using water is absolutely to void warrenty because water is good media for electron, I do not fuck my rig up with water. Oil is not, and there are many options like non-flammable oil like mineral oil, vegetable oil, They are safe for transport. Also safe for electronic equipment.

The people, except intel, try to answer why use oil is better than air if space is very tight, operational coat is very tight. Only few companies right now, answer it.

I am discussing seriously as Intel does big right now.

I few previous talks over this

https://bitcointalk.org/index.php?topic=20994.20

https://bitcointalk.org/index.php?topic=52867.0

https://bitcointalk.org/index.php?topic=119082.0

what I meant was watter cooling as in using water block to cool the rig and dumping the hot air somewere using  radiator

( pones todos menos el de casa  :P)

Running by aTg in the spanish fórum   https://bitcointalk.org/index.php?topic=255643.0  (https://bitcointalk.org/index.php?topic=255643.0)

Oops, gracias (thanks)

The being is no problem at all as the being does not need to upgrade, just replace a newer one.

keep on going guys...

OK...

Oil cooling does work. But unless you have a massive tank with a huge external face surface area, you will soon heat all of the oil until it is too hot to run the card at temperatures that will prolong its longevity. The problem I am referring to is not the temperature of the GPU cores or the VRM transistors themselves that you can see with GPU-Z, but other components that are usually kept passively cool like the smaller transistors and electrolytic capacitors that have maximum temps ~75-90 deg C.

If you are pumping hundreds of watts of heat into the oil, sooner or later you will need to remove that heat actively. You could get a robust pump and flow some of the oil through a heat exchanger, essentially water cooling but with oil instead of water. You could alternatively immerse some heatsinks into the top of the oil (which convenient is where the hottest oil will rise to, because of density changes in the bulk fluid).

You can't run the whole card as-is in the oil. The fan will burn out eventually because it has to work so much harder in the denser fluid. You will need to disconnect the fan and probably remove the plastic assembly, then relying on thermal gradients and density to move the oil past the hot heatsink(s) and components. Failing that, you could install some kind of low RPM stirrer to move the oil. A long time ago on one of the overclocking forums a member even had a rotating oil bath rotating 'around' a stationary motherboard+CPU+etc that was held in place from above, with great success. Sorry, I cant find the link, it was probably archived and lost.

There is a chance that the electrolytic capacitors (in the silver 'cans') will become damaged to the oil you choose. There is very little information available about this aside from the occasional anecdote. The problem is that these capacitors are not always perfectly sealed, after all they were never designed for oil immersion, and as a result the oil changes the properties of the electrolyte mixture in the capacitor and it can fail in various ways.

Another problem is that some oils will cause capacitive electrical problems in some immersed electrical components. This is exacerbated by the high frequencies that some of the components operate at on the cards, and with oil sitting across multiple contacts/pins/traces the capacitive effects can lead to instabilities.

As for cleaning oil off the components then here is my advice:

1. hang the card up by a piece of wire or leaning upright so most of the oil drips out / off
2. rinse off most of the oil with huge quantities of cheap dish washing liquid + hot water. this should remove the majority of the oil. And no, washing many kinds of computer components in water while they are off does not usually damage them so long as you are 100% sure it is completely dry before you power it up. Again the problem of unsealed electrolytic caps remains the only exception and problem here...
3. get yourself a few liters of your typical hardware-store-grade mineral turpentine (usually just $3/L...) and then immerse the card in a bath of it. It will dissolve the remaining traces of oil. It will also help remove any water, because they are completely immiscible liquids and you will see they will separate nicely from one another in the bath. If the oil you chose to use was not effectively removed with the mineral turpentine, try methylated spirits / denatured alcohol which is also very cheap.
4. Remove the card, hang it up near a powerful fan to dry for a long time.
5. your card is now back  to normal, ready for new thermal interface material and heatsink / fan assembly re-installation.

I highly recommend low viscosity oils.