They are backwards compatible but you won;t get the benifits of 1.4 unless your Tv and blu-ray player support it. Given that many upcoming 3d blu-ray players will continue to use HDMI 1.3 I wouldn't worry about it.
I've read up on the difference and I'm wondering which HDMI cable would be best for me. The price is similar at amazon.com, so I want to know if one is better for me than the other.
I just purchased a Samsung UN46B6000 - LEDLCD, 120hz. I will be running my digital cable box through it (Fios) and an eventual BluRay Player.
Is there an advantage of 1.4 over 1.3? Will my setup work with either cable equally well? Will 1.4 work at all on my set?