vram speed

I noticed that my 5700XT Red Devil, when watching just basic content, like YouTube, or other Online Movie platforms, the Vram Speed is all the time at Highest MHz... Like yeah, 480p is so much demanding (especially for Vram) that it needs to run at full speed ? Which causing GPU warming up...

I'm helping my brother build a PC that's used for 50% gaming / 50% video editing, and we were looking at either the GTX 1660 Ti(12Gb/s GDDR6) or 1660 Super (14Gb/s GDDR6). I was wondering if the 14Gb/s GDDR6 on the 1660 Super would give any benefit at all in video editing over the slower...