The quality of the cable that you are intending on purchasing does matter! Please keep in mind your HDMI cable is responsible for transmitting those signals from your source to your TV. If your HDMI cable isn't up to the job it can cause the image and sound quality to degrade.
When shopping for an HDMI cable there a few things to always check:
1.Cord Thickness: A lesser quality cable is like trying to send the signal through a bar straw. There isn't enough room for the current to flow with-out it being backed-up or pinched. A higher quality HDMI cable, and often times a more expensive cable is like sending that signal through a slurpy straw. No problems with the flow!
2. Materials: It’s recommended that you double check is the materials that are used to make the HDMI cable. This includes the internal fibers, and the metal prong that actually plugs into your port on your TV. If internal fibers aren't the correct grade (in-wall or not) that can cause some serious problems.
3. Rating: The last thing to check prior to purchasing an HDMI cable is what it is rated to be used for? In the product description it will tell you what type of signal it is best for. Qualities like Hz rate are noted, any special video or audio capabilities, and also the speed of the cable.
A speed of an HDMI cable is documented in Gbps, which stands for Gig-a-bits per second. Higher the speed the faster that content you are sending to your HDTV can be displayed.