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argon2 - Why does the GPU get a comparatively bigger advantage to the CPU when using higher parallelism in Argon2id? - Cryptography Stack Exchange https://crypto.stackexchange.com/questions/90036/why-does-the-gpu-get-a-comparatively-bigger-advantage-to-the-cpu-when-using-high
> The reason memory-hard KDFs use a large amount of memory is not to slow down computations by making memory bus bandwidth a bottleneck, but to make the computations impossible to perform on hardware that doesn't have sufficient memory.
Cryptography Stack ExchangeWhy does the GPU get a comparatively bigger advantage to the CPU when using higher parallelism in Argon2id?My understanding is that the memory bandwidth of CPUs and GPUs is roughly one order of magnitude difference4, unlike cores which a GPU has many of and a CPU a handful. That is why PBKDF2-HMAC-SHA1