There are a couple of different ways of looking at this issue.
Bottlenecking is NOT an issue if you have headroom.
I have a 7940x and a 1080ti. Technically I have a bottleneck at my GPU, and a pretty good one at that. But, I realistically won't start to see any real performance drops in my workload until they come out with more demanding games because my GPU is already kicking all of my games ass and I can play most everything on epic with no issues. There are certain super heavy workload games that I do start to see issues in like Ghost Recon Wildlands running absolutely maxed settings @ 9-10GB+ of vram usage. But normal games only use about 1/5th of that amount.
So in your case, if you think your 6600k is still doing well enough that you do want to upgrade, a 2070 won't hurt. My brother was using a 6600k and a 1070 and having issues running Escape from Tarkov on high until we upgraded him to a 7700k.
Option 2 is to just take the advice of a bottleneck calculator.
According to this, the 6600k will definitely choke your 2070. https://pc-builds.com/calculator/Core_i5-6600K/GeForce_RTX_2070/0Fs12xlu/
Technically it's also the bottleneck in your current build as well. Though, definitely not by as much as it could have been. https://pc-builds.com/calculator/Core_i5-6600K/GeForce_GTX_1060/0Fs0Velu/
I'd suggest looking to see if you can find a used 6700k or 7700k floating around somewhere in your area for cheap and upgrading that first. You would still bottleneck the 2070 if you ever reached a level of performance that maxed out the card, but it would definately be the best way to upgrade cheaply since you would only need to swap out the CPU. https://pc-builds.com/calculator/Core_i7-7700K/GeForce_RTX_2070/0Km12xlu/
that would be my go, i had a 1060 and a 4th gen i5 for ages but, i dont know how it will be for you when that times comes, but when it came time to upgrade the cpu i could not find a second hand 4th gen i7 so i had to upgrade my whole system to suit a 2070. just a heads up on that
that may be the best option for me is too grab the 2070 and enjoy it , and in a bit when i have the extra cash lying around upgrade to something stronger cpu wise to get the full befits of the upgraded cards
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