Ultra X4 1000watt is $185 on ebay for new now. I think it was premium grade in 2010. Near $1.9 for 10 watts.Have a Ultra X4 1000W (remember the old Tigerdirect?) psu from 2010 running i7 4790... still going strong.
Can you visually tell between the cap style?Power supplies or any other component for that matter can last a while, but you'll see higher failure rates as the years go on. Capacitors especially degrade over time and something that old is likely using electrolytic ones, which are prone to leak/vent.
usually yes, especially failed ones:Can you visually tell between the cap style?
Didn't check, but it works 24/7 almost whole time. I had another Antec case for my HTPC