Two things:
1. The original comparisons were done back in July / August. The 1060 won the battle by about 10% back then
2. In addition, the 106os had a larger OC headroom ... 17,7 as opposed to 7.7 .... so
over the 14 game test suite on TPU, the overall advantage was > 20%
3. With the new drivers, then 480 improved by an
average of 2.1% at 1080p across a 21 game sampling. Grats to AMD for making things better, but that's not going to change anything
https://www.techpowerup.com/reviews/AMD/Radeon_Crimson_ReLive_Drivers/6.html
4. Overall since July / August, AMD's drivers have improved performance
average over all those games by 4-6%.
https://www.techpowerup.com/reviews/AMD/Radeon_Crimson_ReLive_Drivers/8.html
5. We have no info as to what improvements have arrived with nVidia drivers over those months.
6. If one chooses, you can reduce the sampling to 5 - 6 games to **prove** whatever preconceived notion you might have....if you want a wider view... look for sites that test more games.... if you only play a few games, look at each game's performance individually
7. That 4-6% since July / August does not erase the 10% lead that originally existed nor the 20% lead if you were OCing is not enough
So all that being said ....
I'd sit tight till the 1080 Ti drops when we will likely see all new benchies based upon latest drivers from both camps. And again, when looking at test results, if you are overclocking, make sure to adjust for the relative overlcocking headroom before making a decision. Then again, look specifically at the games you play most....the "average" might not apply to your situation.
Again, all that being said
... selling an old card and buying new has other impacts, many of which you won't give a hoot about.
a) You will have to sell the old card at a significant loss.
b) Des your PSU have the extra 80 watts that the 480 needs ?
c) If you don't OC I'd put the cards very close to even but if you do, make sure to take into account the 10%difference in OC headroom
d) Too maintain similar case temps, a extra 120mm fan is recommended.
e) If your paying ya own electric bill and and average gamer, you will spend an extra $50 over three years at electric rates of $0.10 per kw-hr. If in urban / suburban settings with no local hydropower, figure 2.5 times that ... Europe 5 times that.
f) It will be noisier