I purchased a TX650 back in early 2008 for my old Q6600. It survived my upgrade to a i5 2500k platform in 2011, but by 2013, my computer started to shut down randomly. It took me almost one year to narrow the issue down to the PSU, at first I thought it was an overlcocking issue. But by the time I figured out it was the PSU, it was too late. Even more strange is that the PSU sitll works on a weaker computer, and I still use the same 2500k to this day, but with a EVGA 850 G2 I bought last year and the problem disappear. I suspect a bad contact/oxidation ocurred on the motherboard terminal as it seemed that applying pressure in there would reduce the amount of random shutdowns for weeks or months. Strangely, the issue never ocurred again after swapping PSUs.
The 5 year warranty weren't enough for my TX650, (even tough I never registered the product by the time I bought it because I didn't know it was world-wide, so nvm) that.
After over 2 years of headache cause by that PSU, I decided to ditch corsair for as long as this 850 G2 last.
Only good memories of my 650 TX was the insanely low noise fan, it was the most silent 120mm fan, thus PSU, I have ever seen, even after disabling all the hard drives and fans of my computer and only the PSU remaining on, it was sitll inaudible as the eletrostatic noise of the PROCESSOR ITSELF was louder than the fan. I love my 850 G2 passive mode, with a single overclocked MSI 970 fully stressed togetehr with the 2500k @ 4.4 ghz, I never saw the fans spinning up. Even at 28C room temperature in a mid tower case. However, at low noise mode, the fan is very loud, louder than any other fans on my case, which is disappointing, thank god the passive mode works flawlessly.
Anyway, the point is that now that moore law is definetely on its last legs and most improvements are in reducing power comsuption than improving clockspeed + IPC, With the PSUs having passive modes that further increase the lifespans of its fans, 7 years would undoubtedly not be enough for high end psus for a significant large portion of people. (even mid-end) I hope to keep using this 850w. Unless miniaturization and cloud computing complete kills desktops in 10 years even for enthusiasts (which I doubt) I'm pretty condident I'll be still using this 850 G2 in 10 years.