[ELI5] Why is SIMD still important to include in a CPU. When GPUs exist and serve the exact same purpose?

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SIMD to my understanding is supposed to accelerate 3D Processing and other multimedia processing. GPUs do the exact same thing but instead they’re dedicated into doing that role. I heard SIMD is an early attempt to make 3D Processing possible on CPUs

“GPU is a compute device which implements a SIMD (Single Instruction Multiple Data) in a much more multi-threaded fashoin, in fact SIMD is coined as SIMT (Single Instruction, Multiple Thread) in a GPU. So basically GPU is a an extension of the SIMD paradigm with large scale multi-threading, streaming memory and dynamic scheduling”

-Gary Cole, Quora

Unless I’m wrong. And there are many other things SIMD can be useful for other than Multimedia use and can help with traditional CPU tasks like integer operations but I have not found any info of SIMD being used outside of Multimedia use. It could do operations related to Audio which is very handy but couldn’t they instead be handled by a Digital Signal Processing?

My understanding of computer science is limited so I may gather a ton of knowledge to learn with this post

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5 Answers

Anonymous 0 Comments

SIMD is a super if quasi-parallel computing technology upgrade for CPU’s. It’s quasi because the basic idea with parallel computing is theoretical infinite parallel processors, but in fact you are dealing with hundreds or thousands.

This is one way to make programs faster.

So to answer your question, when you want to sired up a computer, it’s better to have multiple options and technology than just two (CPU and GPU).

Moreover, if you have two GPU, that’s better than one, right? Even though they do the same thing.

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