Cable Matters 4K DisplayPort to DisplayPort Cable 3m (DP to DP Cable) with 4K (3840 x 2160@60Hz), 2K (2560 x 1440@144Hz) support - 3 Metres: Amazon.co.uk: Computers & Accessories
3m DisplayPort 1.4 Cable, Anthra Line - from LINDY UK
Product | StarTech.com 3m HDMI to DisplayPort Adapter Cable with USB Power - 4K 30Hz Active HDMI to DP 1.2 Converter (HD2DPMM3M) - video cable - DisplayPort / HDMI - 3 m
Mini DisplayPort 1.2 Male to DisplayPort 1.2 Male 21.6 Gbps 4K UHD 3m/10ft Black
Cables Direct 3m DisplayPort to HDMI M-M Black Cable B/Q 50 (HDHDPORT-005-3M )