this post was submitted on 13 Jul 2023
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Parallel computing is something where you break a big task into a bunch of little tasks that can be completed in parallel by a bunch of different computers. It's something you do on specific problems, rather than something you'd use to speed up video games. Typically, you'd parallelize something like doing a big physical simulation that could take weeks to complete, not something that needs to complete all the math for a frame in 1/60th of a second.
^ This.
Even simple stuff like SLI (having multiple GPUs for rendering games) can be complicated and not widely supported anymore. Parallel computing is basically reserved for servers at this point (which makes sense, if you're running something intensive like an AI service, you don't want to put it all on one server.)