I'm trying to decide what graphics card i should buy for my new build ( Second ever. first was like 10 years ago and i followed someone else's part list which i don't what to do again as it was lacking for what i need. ), i checked out a few guide videos, one of the key things i understood was about clock speeds of the graphics cards the faster the better, However one thing that confused me when looking is graphics cards that i thought to be better had lower clocks speeds, for example i know that a 2080 is better than a 2070 but why would some 2080's have a lower clock speeds than some 2070's.. Can someone clarify this for me and maybe provide some info on how to choose the best parts, as in what to look for or maybe a link to a guide if that's easier. Thanks