File talk:2007TaipeiITMonth IntelOCLiveTest Overclocking-6.jpg
This picture is referenced as an example of liquid Helium overclocking, which is not accurate. The fluid is being poured from a container that contains liquid Nitrogen. Liquid Helium cooling uses a special apparatus which injects the fluid directly into the cooling container, it is not poured into the cooling pot by a thermos in the same manner that liquid Nitrogen is applied. Liquid Helium evaporates much more rapidly than liquid Nitrogen, and that is why it is poured differently - liquid Helium would nearly entirely evaporate before touching the base of the cooling container.
Additionally, a common retail price for LN2 is 2-4 dollars US per liter, while retail for LH can range from 12-25 dollars US per liter. For events of this nature, it is typically transported in a dewar of 180L capacity. An LN2 dewar of that capacity in 2012 can cost as litle as 150 US dollars (well negotiated price at close geographic proximity to production facility in area with good industrial electricity rates) to as much as 750 US dollars (paying full retail in poor geographic proximity to production facility with poor industrial electricity rates). An LH dewar of 180L capacity can cost from 2100 US dollars to 4500 US dollars, or more. Thus a special apparatus is used with LH to maximize its effect due to its cost. LN2 is thus more commonly used by amateurs as its "economical" in comparison to LH, which is only used in corporate sponsored events.
Those corporate sponsored events always include the use of LN2 if LH is used, which is likely the cause of the confusion in this photograph. Again going back to the issue of cost, with LN2 being less expensive, it is used to pull down the cooling container to -190C then LH is used to pull down the temperature further... Minimizing the unnecessary use of LH.
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