What is the most powerful IBM/Cray style custom-monolithic architecture supercomputer ever? Ie not stuff assembled from PC-grade hardware in parallel architectures?
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The current non-quantum record holder should be called neoclassical. Summit.
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All modern massively parallel machines have chips/GPUs that are used in PCs. The ethernet connections between nodes are probably less common. In that sense they are all PC-grade hardware. Not sure what you're looking for; but the Chinese ones may qualify.
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Probably the Earth Simulator? 2002.
en.wikipedia.org/wiki/Earth_Sim
Also depends on how you define "powerful". For some specific tasks (eg lattice QCD) maybe the fastest machines still use custom hardware?


