Hello and thank you for your question.

Your power supply uses a type 4 cable. You can therefore use this cable.

Best regards - CORSAIR Support

The pci-express connections on the rm850 must be type 4. This is specified on the specifications of your PSU, on the end-pieces of the pcie cables of the power supply, or on the power supply itself on the branching side.

Hello, so my RM850 is from december 2015 and I have now connected it to my 4080 with this cable without any problems. Hope could help. Greetings