I predict PSU explosions in your future. Regardless of quality, that's a long time for a PSU. How many years we talking?
Yep, I have to take my hat off to that PSU and the years of hassle free reliable service it has and continues to provide, I'm guess must be around 10 years give or take a couple, and still going strong, nothing wrong with it as reliable today as it was 10 years ago and I predict it will out survive this build and go into my next and still keep going long after, I think they will have to change from the ATX connection standards before I need another PSU. and my current set up is strong my friend, there is 3 years left in this third gen i5 build yet and maybe more, have only added a SSD since the original rebuild with the i5 and don't foresee anything in the close future to bring the need to move on. I think it was on the late stages of Windows 7 when I did my current build, went on and crushed Windows 8 and 8.1 soon after, although 8 was a hated OS I personally never had any issues with it, grew to kind of like it in fact, and now my system is crushing windows 10 running like a dream. and as for the PSU well that goes back to Windows XP.
So yep I thing the decision to get the Ultra X3 Pro 1000w back then, even though I never have nor have to this day need for 1000 watts of power, always run decent G-cards have considered but have never had need for multi g-cards, in fact am glad I have never gone that route, one decent card, am on the Radeon HD 7870 which is still serving well, thought its usually graphics that trips me into a new build, but can still play any game I want with that card, am yet to find a game where I cant go ultra high still with setting, so why have 2 card? if you ask me a second card is a extra expense on a short term extra future fix, that by the time you get round to needing that extra power provided going cross fire or SLI, which will more often than not give you nothing of notice extra, there maybe the odd game where the developers have gone out there way to give you a pat on the back token of effort to add some worthless extra graphical feature if your system is cross fire or SLI, but more likely that the developers could not even be arsed to to even cater for such a feature and disregards it in there requirements to the point where if it actually causes a problem with the game running duel cards they will just ignore that and leave it to AMD / Nvidia to fix there own shit so there duel set ups work with there game not the other way round forcing new drivers that's fix may even be to turn that shit off during such given take so it actually works like it would have fine if only you never bothered with duel cards in the first place.
But seriously if you ask me, a second card will give you nothing but brag rights to say to your friends you have duel cards, and by the time your g-card is dated, its dated even if you have duel, and there is something better out there already to go with instead that's going to run your entire system better with the right build around that single card, than having 2 of the older cards on a older build. So aside from running benchmark software witch is the only real place you will get your pat on the back for running duel cards, since bench mark developers are the only real developers out there that care enough about such features to actually use it, then yea I honestly feel that picking the right hardware at the right time and dodging the scammy features like cross over and SLI is the way go go my friend, for a long term healthy PC that just keeps going.