Pheebs

Hi I have this Purepower 520W PSU which has worked brilliantly for me for 10 years and I still wish to use it but I am not sure it is compatible with the new GPU I intend to buy. My PSU has 2 x 6pin PCI Express power connectors but the new GPU has 1 x 6 pin and 1 x 8 pin conectors. I didnt know if I could plug one of the 6 pin connectors into the GPU's 8 pin power ?