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Google's Liquid Cooling

(chipsandcheese.com)
399 points giuliomagnifico | 2 comments | | HN request time: 0.4s | source
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michaelt ◴[] No.45017512[source]
> TPU chips are hooked up in series in the loop, which naturally means some chips will get hotter liquid that has already passed other chips in the loop. Cooling capacity is budgeted based on the requirements of the last chip in each loop.

Of course, it's worth noting that if you've got four chips, each putting out 250W of power, and a pump pushing 1 litres of water per minute through them, water at the outlet must be 14°C hotter than water at the inlet, because of the specific heat capacity of water. That's true whether the water flows through the chips in series, or in parallel.

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1. idiotsecant ◴[] No.45017835[source]
It just means in series that some of your chips get overcooled in order to achieve the required cooling on the hottest chip. You need to run more water for the same effect.
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2. k7sune ◴[] No.45017998[source]
I can imagine a setup where multiple series of slower cooler water converging into a faster warmer stream, and the water will extract an equal amount of heat away from all the chips whether upstream or downstream.