Another thing to keep in mind is that hashcat can generally test guesses <i>faster</i> then you can feed them over the various connections, i.e. memory -&gt; memory copy for pipe memory -&gt; pcie -&gt; card for loading to the GPU.  Also, in cracking rigs, you often have multiple cards over pcie x1 connections, further lowering bandwidth for those cards.  One thing I&#x27;d highly recommend is trying it with a rules.  This allows the GPU to expand your word guesses out on the GPU itself, turning a single guess into thousands of guesses or more.  This bypasses memory bandwidth issues, as it&#x27;s done on the GPU itself, and also means that a lot of rather trivial checks can happen automatically (try it with a 1 at the end, try it with a 2 at the end, and so forth).