Are there any precautions in using 10-20+ meter hdmi cables with a gpu

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Good time of the day, community.

Long story short - thinking of going for that 55" TV in the room where my PC is, and, of course, connect it to the gpu as a second monitor.

Thing is, by my calculations, I would need a 15-20sh meter hdmi cable for it. I did find cables that would fit for my need, but remember a quite old thing, which occurred in the 2000s - I had a similar problem, but there it was connecting GPU to the VCR, which acted as an amplifier, and which, translated the picture to the TV. It worked well for some time, but in the end, it would seem because of some capacitor or smt struggling with the challenge, the VCR burned out (and I do have a strong feeling that this is related to that 20 meter long signal transit).

So my question is - is it really safe to do so with a gpu (really don’t want to know how to repair my 2080ti in the current state of things), using a 20 meter long hdmi cable?

Thanks

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Depends on the type of cable. Copper based cables rated for that distance are going to cost a fortune, and are going to be very very thick due to all the extra shielding and larger conductors required to maintain signal integrity over that distance.

Optical based cables dont suffer from any of those problems like interference, or distance. But they are directional meaning you cant just plug them in any direction you want, and they can cost a bit more than high quality cables.

I have 3x Optical cables run in my house and they have been fantastic and they are 35m long!

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Is it safe? Yes. Will it work? eeeeek maybe

I ran HDMI from one wall in my office, up, across 12ft and down 6ft. So probably 30ft plus then a coupler and another HDMI cable on either end, and it was a shitshow. I’ve abanded the cable in the wall

I could not get any decent resolution and refresh rate out of it without artifacting

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Thanks. Now I know more and have more research to do.

This is the second thing that troubles me. Thanks

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IMO as @infinitevalence suggested, optical cables will work alright. I went down that road too and I can’t remember what, but something put me off

I ended up just building a dedicated computer for HTPC duties and calling it done

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That’s the thing. All my effort was put into my “one and only”. Going for the second PC (with an RTX card, with a fully silent custom waterloop, plus a ton of hassle for even watching a movie…) just for that purpose would be a huge amount of money on top of the TV. So I want to solve this problem with HDMI (or maybe something more excessive), or at least know if it works before I actually for the TV.

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Out of interest, what do you plan on having on the TV?

I also had a hell of a time matching refresh rates etc, just general multi monitor trouble.

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The regular stuff - series, movies + some gaming. I do understand that it’s 60Hz, but meh. Wanted to go for a projector (read a few things about it being better, but I don’t want to check how well it will perform in both daylight and being as silent as a tv).

Honestly, I’m thinking of either having some sort of switch (didn’t research this yet, but would want to keep only one monitor/tv active at a time), or try to make them work in parallel (but that seems to be more hassle).

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