If you want to go down by 10-20 degrees, a chiller may work. However it is VERY inefficient.
The pelt versions apply the cooling to the cpu and it only. Therefore much more efficient, however by the time you get your board neoprened and siliconed up and attempt to avoid condensation, you may wish you had a chiller. The pelt is the only way to really get GOOOD low temperatures.
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