@raschwarz
on a single 4090 i get ~3600 with -b 8192 -t 64 -p 368 (running more than 1 command on the same system u get out of memory error.)
on multiple 4090's on the same system best is -b 4096 -t 128 -p 256 and you get around ~3300 depending on card.. power..cooling etc.
using nvidia-smi you can see temps,fans and most important to check if you have a power cap.. 400-500W cap is ok under 400W you will see a drop in keyspeed.
best of luck with them puzzles.
