Can I use my old 8 pin and 6 pin connectors from my R9 390 on my new Strix 1080 Ti? Here are the 2 cards: https://pcpartpicker.com/product/Z8cMnQ/asus-geforce-gtx-1080-ti-11gb-video-card-strix-gtx1080ti-o11g-gaming STRIX 1080 Ti ------ https://pcpartpicker.com/product/pxGj4D/powercolor-video-card-axr93908gbd5ppdhe R9 390 8gb