juandeag2k

1660 Super is recommended to run with a 450W PSU.

Your PSU died.

i3 7100, gtx 1060 3gb, 16gb ram pretty low spec by todays standards

It depends how much more a 3600x costs in your country. If the difference is under 30 usd then go for the 3600x 

No, do not get the ASUS as its cooling capabilities are not even that good.

It depends on the price of the subscription as well as the quality of games it promises to give.

Its rare to get insane deals on ebay but not impossible. However, you're much better off looking at your local classified ads.

I dont think its worth upgrading on such an old platform. Best to sabe your money and eventually upgrade to a current generation system.

Then I suppose he could just go for a different brand 5700XT (sell and buy used)

Just replace the blower 5700XT with a non blower version or you may be able to simply take off the stock cooler and put on an aftermarket one.

Yes, it should 

There's basically no voltage control on NVidia cards, any settings that doesnt crash and gives you performance increase is good to keep

It can work without reinstalling but I would wipe the drives and reinstall windows in order to get rid of drivers tied to your old platform. 

Wiping only the C drive should be fine.

It should be fine.

I'd temps are under 70*C at all times and you have a power brick that won't go into overload and a motherboard that can handle more current AND your BIOS allows it. Yes. If any of those is a no - then no.

A PC won't work without RAM. Just wait on the RAM and see if the problems persist.

Make sure your drivers and updates are up to date. Also ensure that your system isn't running into thermal issues. 

Look into the Logitech BRIO, also the other C series models are all good choices.

We need more information.
What do you already have, what power supply? What do you use your computer for? What is the budget?

8gb today is a stretch, let alone in 5 years time.