Major difference between benchmark values and real values on RTX4090 rig

[electronos]

Your motherboard is going to kill a large percentage of your effective speed in any real attack due to the limitation of just x1 PCIe lanes per card. Mining equipment should NOT be used for hashcat, it will cause severe performance issues and potentially reliability issues.

An honor receiving answers from you   . I decided to buy these RTXs on your twitter post about RTX4090 performance . So what motherboard or setup you suggest for 8x Rtx4090 ? and what about that part of my question to clustering some rigs for hashcat ?