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Bing Chat so hungry for GPUs, Microsoft will rent them from Oracle
(www.theregister.com)
This is a most excellent place for technology news and articles.
GPUs are a lot closer to AI processors (tensor cores and similar) than CPUs. Graphics processing is about doing lots of simple computations simultaneously, which is what AI does - lots and lots of matrix maths. CPUs are more general purpose but can't compete on raw speed because of this (and some of the hacks to try to get more speed are causing security problems).