12-26-2018, 02:58 PM
What kind of system is this? You say it is rack mount hardware, but what form factor? I assume since you say the cards are in physical PCI-E x16 slots, it is a 4u system. Does it take a standard atx power supply? If so, just pull the old PSU and upgrade to a higher capacity power supply that can deliver the 8+6 that you need.
If you insist on keeping your old power supply or are not able to source a new one, what/how many connectors do you have to work with? I have seen some adapters that will take two sata power and convert to one 6 pin. I have no idea if two sata power cables can combine to supply 75W though, since a single 6 pin from the power supply is rated to supply that much. Also check your power supply. 4x 1080Ti is a decent amount of power, and you don't want to be maxing out your power supply.
If you insist on keeping your old power supply or are not able to source a new one, what/how many connectors do you have to work with? I have seen some adapters that will take two sata power and convert to one 6 pin. I have no idea if two sata power cables can combine to supply 75W though, since a single 6 pin from the power supply is rated to supply that much. Also check your power supply. 4x 1080Ti is a decent amount of power, and you don't want to be maxing out your power supply.