Sorry for the late response but I found the answer although I don’t use it any more you need a dual link dvi cable so Bassicaly a dvi to display port (powered) they are very exspensive I found one on eBay for £60 and I can confirm it works.
StarTech.com DisplayPort to DVI Dual Link Active Adapter - DisplayPort to DVI-D Adapter Video Converter 2560x1600 60Hz - DP 1.2 to DVI Monitor - USB Powered - Latching DP Connector (DP2DVID2) https://amzn.eu/d/3ax0EKf