#MajorHeat# arrives with bright skies, deep green trees, and the full warmth of summer on #PKUCampus#. As the summer break continues, may these long days bring rest, discovery, and new inspiration. #PKUCalendar# #24SolarTerms#

In hardware, pioneering innovation often leaves you without a supply chain. There are no suppliers, no vendors at the ready, for radically different architectures. We spent 3 years building a heat sink and cooling system. Our wafer is about 58 times larger than the largest GPU. There were no components in any catalogues ready for a wafer scale chip. The heat sinks on the market were built to cool chips 1/58th our size drawing 1/50th the power. We went to every major heat sink vendor. The answers were always the same. “You need a 46,000^m2 heat sink for 15KW of power for a chip?" "We've got nothing for you." So we built it ourselves. It took 3 years. 2016 to 2019. We went through dozens of iterations. JP one of our co-founders and chief system architect insisted we go to water cooling. I thought it was a bad idea. At the time, we knew nothing about liquid cooling. One of the hyperscalers told us categorically that they would never use water to cool. JP convinced me. We delivered one of the first production AI systems to use water cooling. Google announced its TPUs would be water-cooled around the same time. The nay-saying hyperscaler is now nearly 100% water cooled. NVIDIAs leading GPUs are now, 7 years later, water cooled. We became a world leader in liquid cooling - from knowing nothing about it. And we are still the only people who can cool a chip our size. We can run our wafer scale engine cooler than GPUs. And they are therefore more reliable. As heat is the enemy of electronics. When you do radical innovation, there are no vendors waiting to sell you a part. You have to inspire them to build something that's never existed, or do it yourself.

It's #MinorHeat#! Summer break is here, and #PKUCampus# is settling into a slower pace under bright skies and warm sunshine. Wishing everyone a season filled with rest, discovery, and sunny days ahead. #PKUCalendar# #24SolarTerms#