Keyhunt use CPU and RAM exclusively. In BSGS mode you need more gigabytes of memory. You can use the graphics card at the same time on other applications. I personally use RTX 4070 for WifSolver CUDA application and I have a speed of approx. 4.3 GKeys/s, at the same time as the 2 Ekeys/s of Keyhunt (with i9 14900K and 192 GB RAM)