[citation][nom]rubix_1011[/nom]The article fails to recognize that you still have to cool the oil- the heat being absorbed by the oil from the servers has to be dissipated or removed, but this is not discussed at all. You cannot simply fill a bucket full of mineral oil, submerge a PC and call it a day. We have these kinds of discussions in the watercooling forum all the time and it simply isn't as simple as passive submersion.[/citation]
Yes, you still need a cooling solution, but this is hardly a problem. The hardest part of cooling is getting extreme temperatures away from very small areas, which the mineral oil does quite nicely. Once that is done you can do the rest through heat-pipes, radiators, or even some sort of refrigerant, but because the heat is so easily dispersed from the most dense areas, you can use much lower impact cooling solutions to do the cooling, thus the cooling costs of ~2-3% compared to a normal cooling solution in a traditional server of 40-50%. The same amount of over-all cooling (heat dispersion) is required, but it is simply much easier to cool something with a surface area of several hundred square feet (like a radiator), compared to cooling something small like a U1 or U2 heatsink.