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PC 4K 43" monitors
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PlainName:

--- Quote ---The only actually issue I have, other than the constantly using the wrong keyboard or mouse for the two systems
--- End quote ---

In a similar situation I've used Input Director ( http://www.inputdirector.com/ ) to use a single keyboard mouse with two (or more) systems. Basically, the mouse can move from one system's screen to the neighbouring screen Just Like That and the mouse/keyboard input follows where the mouse is. Works over the network so no special cabling or connections required.

Logitech seem to do something similar with their recent mice/keyboards, but that's restricted to their products. Input Director works with anything. There's a similar one, Synergy, which I tried but don't use. Since it's derived from some open source stuff, there are two version of this:

https://github.com/symless/synergy-core - the open source core part
https://symless.com/synergy - the commercial version
paulca:
The tricky part is the work laptop and the rest of the network are firewalled from each other.  That is to protect both ways.
SiliconWizard:
So you have a 34" monitor and a 43" one next to it? Looks more like a room at the NASA headquarter than a regular desktop. ;D
tkamiya:
I've done this with regular size office desk.  Technically, it worked fine.  Low refresh rate didn't bother me.  But, 43" was just too big.  There has to be so much eye movement, after a month or so, I took it down.

I am now using 32" monitors.  One in front me and another to the side.  Side ones are used to "park" stuff that I want it running but not actively using.  Good luck and have fun.
paulca:
So the monitor arrived.  All hooked up.  Like always, new monitors always seem too bright and cold to me.  Always happens, no idea why.

Size:  Yes, it's big.  Sitting beside the 21:9 it's a little wider, but the 21:9 appears to occupy about half the height.  A full screen browser look stupid, tiling it in 4 works brilliantly with the less used at the top.

Picture:  No fuzzies or issues with red text that I can see, but I'm not that fussy.  Looks okay gaming too.  There is a very slightly screen-door effect, but I think it's actually some odd filtering and dithering showing up on upscaled content.

HDR:  Meh.  I tried it, can't get it setup to look normal on an SDR desktop so I switched it back off for now.  It honestly looks like it's reducing the SD content's dynamic range making it look washed out, weak in saturation and too bright.  If you take the SD region slider down so it's not too bright it really looks weak, contrastless and virtually no saturation.  If I turn the NVidia "Digital Vibrance" to 0% the screen is black and white.  I think I need to do some reading up on how to set it up properly, for now it's off, which is anything is too vibrant and could use the Digital Vibrance turned down!

It has working speakers which was a pleasant surprise.  It was missing it's remote (stated in the details of the item), but that's just one less unused monitor remote in a box.

The HP Prodesk mini PC does produce 4K@60FPS on it.  However, watching youtube content at 4K fullscreen even if it's upscaling from 1080p and the CPU/GPU starts to get pretty warm.  It will play content fine, but if you start skipping back and forth, full screen, back to desktop, full screen and so on, the GPU will thermal throttle and frame start to get dropped all over the place.  I took it apart, checked, cleaned the fan, reassemled and sealed up an air leak with captan tape between the fan and cooler.  Hopefully it will hold out.  If not, another 8Gb of RAM and I'll swap it with the server box and put a GTX1030 in it.
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