8-pin

Hi, I'm looking to upgrade my current GTX960 gpu to a 1080. My current GPU is using a 1 x 6pin power connector, but the 1080 requires 1 x 8pin. My PSU (600W, so no issues there) has a 1 x 6-pin and what looks like 1 x 6+2pin(?) cable available but no 8-pin. Would a simple 6-pin to 8-pin adapter...