[RndTbl] How Long Can HDMI Cable be Run? -- Blue Jeans Cable

John Lange john at johnlange.ca
Wed Sep 9 14:21:17 CDT 2015

The place I usually go for cables is monoprice.com. They don't mention the
HDMI certification level on any of the cables that I randomly clicked on,
but they do clearly state "supports 4K @60Hz" on some of them.
Unfortunately there is no way to filter only the cables in that category.
The information is hidden in the description so you have to click them

Interestingly, it also appears that long HDMI cable lengths are possible
(100+ feet) because the cable makes appear to be embedding some kind of
extender chip into the cables themselves.


On Wed, Sep 9, 2015 at 2:01 PM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> Worse still, after spending another 2 hours looking into it last night,
> I found that it is incredibly hard to tell what cables are what.  Sites
> say that legally speaking, the HDMI group doesn't let cable vendors
> label their cables as "1.4" or "2.0".  They are only allowed to say
> "High Speed HDMI", which is near useless in telling you anything.
> It turns out that it's not just rez but refresh that has to be factored
> into your cable purchase.  I guess that's a holdover from HDMI's TV
> focus.  TV's are fine with 30fps.  Most computer people need 60fps.
> For instance, you *need* HDMI 2.0 to do 4k at 60.  But they can't label
> their cable as "2.0", so WTF are you supposed to do?
> I talked with my reseller rep at Startech and they said none of their
> HDMI cables are 2.0 even though they loudly exclaim "ultra hd!" and
> "4k!".  He said they are all HDMI 1.4 or 4k at 30.  Luckily 1.4 will also
> do my required 2560x1440 at 60, so in my case 1.4 is good enough.
> However, if I was super bleeding edge I'd be getting a 4k monitor and
> then be stuck having to find a 2.0 cable amongst these wacky labeling
> rules.
> C2G's HDMI cables claim to do 4k at 60, so there's a safe option... unless
> they are lying!
> P.S. Michael is almost certainly right when he said at the meeting that
> you have to manually add the 2560x1440 rez into xrandr once you have
> the correct components in place.
> P.P.S. It looks like 2560x1440 is doable with HDMI, just with so many
> caveats most people can't get it working and switch to DP.  I've picked
> out a cable and a new inexpensive VC that should allow me to get this
> working.  (And vdpau, which I've wanted for a while...)  I will report
> back in a few weeks.
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John Lange
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