Does GPU clock speed matter?

[KrazyforOnce]

This question is asked millions of times on the internet but I don't know who to trust! According to puget systems, "The number of cores, memory size/type/speed, and overall architecture plays an important role as well. However, with all other things being equal, a higher clock speed card will always be faster than a lower clock speed card. The downside to a higher core speed is that the higher it is, the more power (and thus heat) is required." but when I research further people say it doesn't matter and just look at benchmarks or something like that. 

[themctipers]

if you had a 1070 running at 1ghz over 2ghz, yeah its going to be bad

 

but 1950mhz against 2050mhz, small difference but still a difference.

[RGProductions]

Apples to apples with everything else, Ie a 1080ti at 1500mhz, and a 1080ti at 2000mhz, the higher clocked card will be faster.

[KrazyforOnce]

1 minute ago, themctipers said:

if you had a 1070 running at 1ghz over 2ghz, yeah its going to be bad

 

but 1950mhz against 2050mhz, small difference but still a difference.

thanks!