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Q: 3rd monitor on docking staton?
Hi all.
Before this thread goes cold, I'd still like to know : Has anyone tried using the Kensington Universal Multi-Display Adapter (https://www.kensington.com/en/ae/452...isplay-adapter) on a USB3 port of the docking station itself to add a 3rd monitor ? a) Would this even work? (Kensington says in the docs that this is to add a *second* monitor) b) Would the 3rd display be laggy? (doesn't have to be blazing fast, this would be for Mail, Excel, Word, etc) Anything I'm missing, or suggestions? I'd really appreciate it. Thanks x13 (please reply in thread) --------------= Posted using GrabIt =---------------- ------= Binary Usenet downloading made easy =--------- -= Get GrabIt for free from http://www.shemes.com/ =- |
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Q: 3rd monitor on docking staton?
x13 wrote:
Hi all. Before this thread goes cold, I'd still like to know : Has anyone tried using the Kensington Universal Multi-Display Adapter (https://www.kensington.com/en/ae/452...isplay-adapter) on a USB3 port of the docking station itself to add a 3rd monitor ? a) Would this even work? (Kensington says in the docs that this is to add a *second* monitor) b) Would the 3rd display be laggy? (doesn't have to be blazing fast, this would be for Mail, Excel, Word, etc) Anything I'm missing, or suggestions? I'd really appreciate it. Thanks x13 (please reply in thread) You have to sort through the reviews here carefully, as five different devices are in the review entries. https://www.amazon.co.uk/Kensington-...ws/B00B99FSUS/ But people seem to be happy with it. There was one report of mouse lag. But generally not the kind of comments I was expecting (the display adapters in the USB2 era, the reviews were an earful). Note that RF emissions from USB3 can affect Bluetooth and Wifi, and sometimes a wireless mouse, has to be moved away from the USB3 cabling. The single biggest source of lag will be Windows. I've tested with two video cards before (not SLI) and there was lag between the monitors tied to the two different cards. I don't think Windows makes the driver calls simultaneously. There can be "thru-delay" on monitors. Some monitors have a four frame delay between a byte on the input connector, versus a pixel on the screen. And with a USB adapter, there is compression delay. Which could be a bigger contributor. I wouldn't go into the purchase, assuming "gen-lock". To get absolutely locked screens, you need either Eyefinity type solutions (locking together at the crossbar), or the usage of the Matrox type solution (which reclocks the data to multiple output connectors, from what the video card thinks of as one display). But once multiple devices are involved, the OS/driver stuff just isn't going to be synchronized all that well. Someone measured the latency on a USB3 developer kit, and got about 30uS. And because USB3 isn't polled, it doesn't have nearly the issues that the 8KHz polling rate of USB2 had. I don't expect a problem coming from the USB3 part of this. But something in the OS has to compress the pixmap, or compress deltas to the pixmap, to be sent over the USB3 cable, and that could be a longer delay. And for a given one of these components, we don't know the details of the compression method used, or whether compression is even used any more (I fully expect the compression to be "adaptive"). https://stackoverflow.com/questions/...ncy-of-usb-3-0 You also have to consider whether there are any bottlenecks in your particular hardware. The USB3 port on an Intel Southbridge is about the best, because the hardware bus behind it isn't a bottleneck (effectively DMI four-PCI-Express-lanes worth). USB3 chips added to the computer motherboard separately from the Southbridge, tend to be slower. Maybe you get 220MB/sec or so. For high bandwidth devices (like the BlackMagic USB3 video recorder), the manufacturer sometimes includes a measurement tool, to detect whether you have a "good, better, best" USB3 port. The BlackMagic product for video capture, needed a really good port to avoid dropping frames. You're driving more than one monitor in this case. The drivers could change compression methods, if they detect there isn't sufficient bandwidth. And if one Kensington adapter decides to use a different level of compression than the other, that's definitely going to cause a preferential lag. Keep a positive attitude, but don't expect miracles. Be pleasantly surprise, if it's totally seamless. Paul |
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