"it's slower than regular 1060,"
When talking about clock speed you would refer to that as speed, or you meant slower as in the card has less performance? You can get a 4ghz pentium 4 processor which would be faster than my Ryzen7 since it's clocked at just 3.7ghz as in the pentium 4 performs more operations per second than the Ryzen, the obvious difference is that most of those operations generate nothing but heat lol.
Think perhaps just confusion as you think the terms Clock speed and Speed are unrelated terms? But yeah both versions of the 1060 run at the same speed, there is just 10% less cores in the 3gb version which ends up obviously creating 10% less performance (in a perfectly optimized scenario for the 6gb version)
No, I really didn't - that has nothing to do with clock speed.
Being slower or faster is usual term used when comparing CPUs/GPUs...unless one is grammar nazi or has no grasp on how hardware works, since one card being slower or faster than the other is never compared via clock speeds (unless they are exactly the same cards clocked differently).