08-15-2024, 09:10 PM
The 4090 has gotten faster as the drivers have matured. The 7900XTX might have gained a bit, but overall it's just an inferior card and moreover, the drivers and runtimes, while progressing steadily, are still quite a bit more painful to deal with if you can even get them working properly. Hashcat is optimized fairly well for both, and in the vast majority of cases the code that runs on all types of cards is identical since we only write one agnostic kernel in a form of OpenCL and JIT compile it with the respective runtimes. The 4090 is just an absolutely monster of a card for tasks like this and AMD has had trouble competing on the high end for a few generations. If anything, it's surprising how well AMD cards can close the gap in games even. Aside from the 4090 simply being quite a bit more powerful, Nvidia also supports hardware instructions that AMD does not that give it a pretty significant advantage in quite a few algorithms. Namely, LOP3.LUT iirc. It's very difficult to recommend AMD cards in general, at least for now, unless you are constrained by budget or otherwise.