So My first plan was to buy another gigabyte gtx 960 (used of course) and then put it into sli. But my motherboard only supports Crossfire. I heard that there are hardware hacks for achieving sli this way, but some say it's better to just buy a 1060 or 1070. I'm not sure which route should I take. My CPU is a i5 6400 and a Gigabyte GA-H170-HD3 motherboard.