Can i connect asus strix gtx 960, which has 6 pin, to 8 pin psu? ( i do not have a 6+2 cable, just one cable with 8 pin to an end and 6 pin to the other)
It works like this, but will it be ok on long term?
Yes it's fine, the plug is the same as a six pin, just with two extra things for a GPU that needs them. modern powersupplys all come with 6+2 PCIE cables, so you always have the option of either making it a 6 or an 8 pin.