My guess is your mesa driver was old so you didn't have graphics pipeline library enabled by default. distros doesn't differ but packages.

its the actual speed but it gets doubled because the ram is ddr. so 1075*2 == 2150mhz should be what you've been looking for.

i don't know about the voltage sorry.

mpv

in turkish he/she is just "o"

KDE's Discover has a button for that. I always delete the app and leftovers from there.