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Only @ Best BuyEnhance your entertainment experience with this Dynex HDMI cable, featuring a 3-foot length that hides easily behind your components. Triple-layer shielding protects the cable from interference, creating a seamless picture. This Dynex HDMI cable supports resolutions up to 4K UltraHD with speeds up to 18 Gbps so you get every second of the action.
Supports up to 4K Ultra HD (4096 x 2160 pixels) resolution
To aid in getting the very best picture from your 4K source.
90-day limited warranty
To protect against defects in materials and workmanship.
A:AnswerYes you are correct and I do the same thing myself.
If volume is still coming from your computer, go to your volume preferences and choose "External Speakers" which should also show some ID of the TV you are connected to.
A:AnswerYou would need these cables, if you wanted to hook up any accessories to your TV such as a gaming console, or a DVD/Blue Ray player. That is the sole purpose of cables such as these, has nothing to do with cable. If you don't plan on hooking anything up to your TV, these are not a necessity