Wow, they actually have different cables for 60Hz and 120Hz??? Some cables are a big scam, but they usually aren't THAT blatant about it.
The panel in the TV is what goes at 60Hz or 120Hz, the source material doesn't change one iota!! On a 120Hz TV the TV itself takes the input and displays frames multiple times. If the input is a 60Hz NTSC signal it'll display each frame twice. If it's a 24 frames per second signal from a blu-ray then it'll display each frame 5 times. (That's the appeal of 120Hz panels btw, it's evenly divisible by 24 so there's no 3:2 or 2:3 pulldown required, no jumpyness, movie displayed as it was intended).
I'm stunned. Unless there's a source that's actually capable of outputting a 120Hz signal I guess, but I wonder if the TV would even accept it.
Anyway, anything that's HDMI 1.3a from monoprice will be fine at that length.
As Max said it's digital, either it works or you'll get significant display artifacts (in HDMI you'll get "sparklies" all over the screen or a blank screen).
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