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Unless you have a tester/latest spec devices to check if it works with them or it's written on the cable, you likely can't.
Ah so ocuk sold me a 2.0 cable and it's described as 2.1 on their siteOfficially licensed HDMI 2.1 cables should have the Ultra label stamped on them but not all do probably so they don't have to pay, most just say 8K UHD.
. It's now going to cost me to return it , not fair 
Ah so ocuk sold me a 2.0 cable and it's described as 2.1 on their site. It's now going to cost me to return it , not fair
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What cable did you buy do you have the link ?
I think it's version 2.1 of that particular cable and not actually a HDMI 2.1 cable.
I think it's version 2.1 of that particular cable and not actually a HDMI 2.1 cable.
2.1 should be Ultra High Speed as others have mentioned.
yea i get it but thats a bit of a con. i was refering to hdmi 2.1Not if the 2.1 refers to the revision (redesign) of a lower standard hdmi rather than the cable being an actual 2.1 hdmi standard cable.
So if the company designed a hdmi 2 cable, and then decided to redesign the hdmi 2 cable it would be revision 2 of the hdmi 2 cable, its still a hdmi 2 cable, just redesigned, it isn't a 2.1 hdmi standard cable eg they could change the colour of the cable . Then if they redesigned the version 2 of the hdmi 2 cable eg by changing the colour of the cable again it is now version 2.1 of the hdmi 2 cable. Changing say the colour of a hdmi 2 cable and calling it v2.1 of the hdmi 2 cable doesn't make it meet the standard of a hdmi 2.1 specification cable, all that is changed in this example is the colour of the cable
