The basic idea is not to pay 2K+ euros to check if a grid will work form me. I dont not want to flash the bios. I just need to hard mod a 680 or 690 to grid k2 / k1. I know that this is doable, but I need a positive confirmation that a hacked card will work as intended in esxi/horizon
It is possible but you need to start with the correct nvidia card to start with.
see here
https://www.eevblog.com/forum/chat/hacking-nvidia-cards-into-their-professional-counterparts/75/