this post was submitted on 28 Nov 2023
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Memory bus width != CPU Bitness
Those two numbers describe totally different things.
For GPUs the bitness number is usually used to describe the width of the memory bus that is how much data can be "transported" concurrently.
For CPUs the bitness describes the size of the data that can be processed at any given time. With AVX, CPUs can handle data vectors that are up to 512-bit long.
GPUs are in fact 64-bit processing units, the largest data type they are designed to handle are 64-bit double precision floating-point numbers.