Re: Claymore's ZCash AMD GPU Miner v8.0

XFX pro 850W 80+ bronze
box says 2x 6/8 pin, 2x 6-pin, 24-pin mobo, 8-pin cpu along with abunch of molex and SATA connectors.

You can try to plug one 6-pin and one 8-pin plug to your card.
Or you can look for PCI-E 6 to 8 pin adapter, like this one