If this can help, or somebody can answer me if already did:
I need to test shortly a 4K led tv connected to Sp3 with a cable I bought already in amazon.com because in youtube videos I already seen setups with Surface Pro 2 with an ACCELL active mdp to hdmi 1.4 adapters.
This one do not need to be powered via usb, so I will try again to connect to the docking 3 and to see if this works or even this solution will work only on the minidisplay port of the device only (the sp3 tablet).
In America are popular the cheap SEIKI 39" led 4k tv, I'm going to test in Europe unfortunately with a Blaupunkt 39" that is more expensive, and I will post here how went. I will have this led tv not before 20 days. As I have it, if IT WORKS for me will be ok to use the docking because I will work usually with a 4K 39" led tv int he future and if I need to use smaller monitors in travels for short periods I can opt to plug them directly on the device.
I hope it will work. So if somebody already tested the docking with a MDP to HDMI 1.4 active cable adapter like the ACCELL or the new model of Startech.com ... please let me know. I bought also from amazon.com HDMI cables (
amazon basic + another one of another brand, to have 2 cables just in case of one of the 2 got some issue) that support this standar. Finger crossed, but if somebody already tried... please let us know.
Are very few the users with 2560x1600 resolution set up (like Dell, HP, LG monitors) because those monitors cost over 1200/1300 USD and over 1000 euros, but now with 4K led tv so cheap there will be more people willing and already testing set ups for higher resolutions and much more content to show on their displays without the need of multi display/monitors, who want to use just one monitor for job and concentration knows why is so important to have just 1 monitor and if it is 4K instrad of 1600p it's much difference.