Passive DP++ to HDMI/DVI adapters will have a maximum resolution of 2048x1152 on HDMI or DVI. UHD on HDMI is possible using an active DisplayPort to HDMI 1.4 adapter.
UHD modes are support on Windows 7 and later. Windows XP and Vista will limit the DL-5000 output to 2560x1600. Mac OS X support for UHD is available from v2.3 Mac OS X software.
Your current computer does not need to support UHD to be able to use a DL-5000 product to enable UHD. As long as it meets the recommended system specs for UHD, it will support a UHD display.See the DisplayLink shop for products based on the DL-5000 family.
Some manufacturers have created UHD HDMI products using the DL- 5000, which converts DisplayLink's DisplayPort output to UHD HDMI internally. Unless specifically stated on the product, do not assume that the HDMI output will support UHD resolutions.