03-28-2025, 07:41 AM
There is no good hardware that's readily available for bcrypt. That's sorta the point, the algorithm was designed to try and ensure this was the case.
As for your specific case, 4090s are the fastest cards you will be able to find and rent, and likely the most cost efficient as well. The speed issues you are seeing are likely related to mixed cost factors in the same hash file, or perhaps some workload tuning issues. All in all, 2kh/s doesn't sound that bad for what you are doing and if that's not enough, 7kh/s is certainly not going to be enough either. At these speeds, you're not going to get much from switching hardware, as even if it doubles your speeds, most attacks are still going from "completely infeasible" to "still completely infeasible". I would simply stick with the 4090s and work on optimizing your attacks and methodologies, as that's going to be required regardless of the hardware you end up with since there is nothing readily available that will give you vast improvements in speed.
Unfortunately, what you are trying to do is something most people simply don't even attempt due to how slow and constrained it is and how hard it will be to crack almost anything. Those of us who do work with hashes this slow have spent a very long time working out attack optimizations and hardware solutions and despite all that work and sometimes significant financial investment, it's STILL incredibly difficult to work with bcrypt.
As for your specific case, 4090s are the fastest cards you will be able to find and rent, and likely the most cost efficient as well. The speed issues you are seeing are likely related to mixed cost factors in the same hash file, or perhaps some workload tuning issues. All in all, 2kh/s doesn't sound that bad for what you are doing and if that's not enough, 7kh/s is certainly not going to be enough either. At these speeds, you're not going to get much from switching hardware, as even if it doubles your speeds, most attacks are still going from "completely infeasible" to "still completely infeasible". I would simply stick with the 4090s and work on optimizing your attacks and methodologies, as that's going to be required regardless of the hardware you end up with since there is nothing readily available that will give you vast improvements in speed.
Unfortunately, what you are trying to do is something most people simply don't even attempt due to how slow and constrained it is and how hard it will be to crack almost anything. Those of us who do work with hashes this slow have spent a very long time working out attack optimizations and hardware solutions and despite all that work and sometimes significant financial investment, it's STILL incredibly difficult to work with bcrypt.