How could you tell between 1.2a and 1.3a ( HDMI Cable )?

Question

???

Answer 1

You can not - it is mostly technical specs, not the appearance.

But there IS a difference - when I upgraded my processor to 1.3a, I had to replace two of my cables - was getting flicker.

Answer 2

Here is the answer from the HDMI web site

Q. How can you tell the difference between a v1.2 and a v1.3 cable

You really can't. There are no technical differences in most Type A, Cat 1 cables. While there are real differences from a technical standpoint between a Type A, Cat 1 cable vs a Type A, Cat 2 cable, cosmetically, and most importantly, most standard 1080p applications do not need the Cat 2 cable.