| General > General Technical Chat |
| Displayport 2.0 MST HUB chips anywhere ? |
| (1/1) |
| Hella_Wini22:
It irks me that there are no good small cheap AMD Motherboards that could drive 3 or more DP 4K monitors at the same time. Even though SoC itself offers 4 graphic outputs (DP/HDMI), MoBo manufacturers charge those DP connectors as if they were made of gold. Which leaves using MST hub as the only option. But MST HUBS are generally expensive AND they are limited to older versions of the standard (1.4a), which means only half the bandwith that is available on latest AM5 chips (DP 2.0) etc. Since these are in general quite simple PCBs (basically only HUB chip + connectors), I've thought about rolling one of my own. Even better, as people generally change MoBo/CPU/RAM more often than monitors these days, such a DIY hub could be even more cost effective, especially if done in open-source fashion... But I've problem with finding a HUB chip that supports the latest version of the standard. Basically, all that I've managed to find is Kinetic Technologies HUB. it's $14-ish (which is fine), but it only does DP1.4: https://www.kinet-ic.com/KTM5030/ Would anyone care to share better idea ? |
| Miyuki:
For AM4 there are some boards with 2x DP + 1x HDMI and 1x DP + 2x HDMI If you are okay with 4K@60 then you can use a cheap 1.4 hub I was looking at this bad situation recently as I wanted to upgrade my computer where I use Thunderbolt hub for all monitors But the situation was solved with one huge 8K screen 8) |
| Hella_Wini22:
I know about those boards. But their spectrum is very narrow, they are usually very expensive and still far from ideal in that respect. For example, there is still no decent mini-ITX AM5 board that could run 3x 4k@60Hz. There is no board with 4 DP connectors, even though SoC supports that. Existing MST HUBS are at most DP 1.4, so they can do up to 2x 4k@60Hz In the meantime, it seems that I've found my answer (which is yet to come) - VMM9430: https://www.synaptics.com/company/news/synaptics-introduces-displayport-21-and-displaylink-quad-display |
| Hella_Wini22:
--- Quote ---One option could be to look for motherboards that support DisplayPort over USB-C, as these can often drive multiple displays with a single port. --- End quote --- AFAIK those are no different than ordinary DP port as far as the display goes, except for the suppoprted bit rate. USB-C in that case operates in DisplayPort mode, except that it sometimes doesn't support highest bit rates. That solves me nothing. USB-C with DP as rarer than DP output on AM5 boards. --- Quote ---Additionally, some graphics cards support multiple displays through a single port via MST (Multi-Stream Transport), which can allow you to drive multiple displays with a single card. --- End quote --- I was counting on universal MST support that is part of the spec. But that still means that I need MST hub, which is currently lagging the newest available standard version (2.1) and is expensive to boot, --- Quote ---You could also consider using a USB-C dock with multiple DP ports, which can be a more cost-effective solution than a dedicated MST hub. --- End quote --- They are the same thing, only connector is different. But that's a good idea. Maybe there are cheaper options in that form, even if I end up needing DP to USB-C cable. |
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