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
Thx for your help, gonna order a couple of those right now.
@bardacuda good luck mate, tell us how it went
well im using different types of reductions/splitters and it works well for me as i added 1x r9 290 to another 3x r9 390.... had the same problem that no free port on the PSU ...
sorry for the late response
GLhttp://www.ebay.com/itm/PCI-E-6-pin-to-2x-6-2-pin-6-pin-8-pin-Power-Splitter-Cable-PCIE-PCI-Express-/151501045756
https://www.amazon.com/JacobsParts-Express-Power-Splitter-Cable/dp/B00JLU0UQ4