| I cool a wafer scale with a liquid that boils at 43 C and immersing the wafer in this liquid. The bubbles (cavitation) of the boiling liquid should not damage the surface layers of the wafer, of course. This boiling liquid is further cooled by water and a sonic heat pump moving the heat into a water tank where the stored heat is used for showers or cooking [1]. Given 45 trillion transistors (45x10e12) times 3 femtojoule (3x10e-15) to switch each transistor at 1 Ghz (10e9) you get 1.000.000 joules/sec = 1 megawatt. These are ball-park numbers, back of the envelope calculations. In reality I make full physics simulations and electrical SPICE simulations of the entire wafer on a supercomputer aka on the wafer scale integration FPGA prototypes and the wafer supercomputer itself. The EDA (Electronic Design Automation) software tools we write ourselves in Smalltalk and Ometa, and these also need our own supercomputer to run on. Of course the feedback loops are Bret Victor style visualizers [3][2].
Apple Silicon or this small company demonstrate that only with custom EDA tools can you design ultra-low power transistors to prevent our wafer to melt. The FPGA prototype is a few thousand Cyclone 10 or Polarfire FPGA's with a few terabytes/sec memory bandwidth or a cluster of Mac Studio Ultra's networked together in a Slim Fly network that can double as a neighbourhood solar smart grid [5]. You need a dinosaur egg to design a dinosaur, or is is it the other way around? [6] A TDP (Thermal Design Power) of 1 megawatt from a 450 mm disk is huge, it will melt the silicon wafer. But then not all transistors are switching all the time and we have the cooling effect of the liquid. We must power the wafer from a small distance inductively or capacitively, best with AC. So we need AC-DC inverters on the wafer, self-test circuits to make sure we find defects from dust and contamination and isolate those parts and reroute the network on the wafer. [1]https://vimeo.com/731037615 at 21 minutes [2] https://youtu.be/V9xCa4RNfCM?t=86 [3] https://youtu.be/oUaOucZRlmE?t=313 [4] https://bit-tech.net/news/tech/cpus/micro-magic-64-bit-risc-... [5] https://www.researchgate.net/profile/Merik-Voswinkel/publica... [6] Frightening Ambitious Startup Ideas (dinosaur egg) https://youtu.be/R9ITLdmfdLI?t=360 http://www.paulgraham.com/ambitious.html |