What is Ethereum's input data size per hash?

[tugrul_448cores]

I'm writing a simple benchmark and it works for 1 byte --> 512bit hash for sha3_512 algorithm and now want to test realworld sized data.

For example, nvidia announces that a titan-xp can hash at a rate of 50 MH/s but at what size of input data in bytes?

I tested 128 bytes per hash for input and RX550 does nearly 5 MH/s (each hash result is 64 bytes)