I built a Q9650 on an ASUS P5Qpro MB back in 2008 and just 4 days ago built a new computer seeing that my old one was about to die the HDD was going out it was slow took almost a full 4 min to boot up! But all in all I got 9 years of service out of the system and could get even more as it still works just like I said slower than snail shit.
SO to sum it up I got 9 full years of service from my last build.
My old Q9650@3.6GHz under a Xig S1283 + CM120 fan, P5Q Deluxe @ 400FSB, 8GB (4x2GB) G.Skill DDR2 1066, PC Power & Cooling 700W PSU (non-modular & 80mm fans), AMD HD5870 1GB OEM, 1TB WD Black HDD all in a CoolerMaster HAF932. I sold it to a co-worker in 2011 after using it for a couple of years and wanting to move onto the next. Was a damn good setup, super stable. I ran it at 4GHz when I had it and never had an issue.
My co-worker sold it to his brother in law around 2013. I've given it a yearly once-over every year since. Last time I saw it, was still running decently well for an old Core2 DDR2 rig. It's nicknamed the file cabinet and it has become kind of a relic, ready to fire back up.
I have most of my old P4 Prescott build single core hyperthreaded Netburs lol, not the original RAMBUS setup anymore, but the DDR1 version is more solid anyways, even have the Zalman 7700AlCu for it! It collects dust and will eventually be gone lol. Damn to think back to all those builds when I swapped out hardware all the time just to see how different combos OC'd and performed. The legendary Core2 era...IMHO.
But i have to give you props man, that was a good run as your rig. My current PC, the Haswell setup which started as a 4770K, is going on 5 in June (2013), so far is still a beast. Has only been in this current configuration for about two years (RAM and GPU upgrade), with a case upgrade the year before that to the Corsair case and PSU upgrade, 960GB SSD added the year before that, 4790K and second Noctua fan before that. Lol it just keeps going and going, but has ultimately resolved an OC'd Haswell/Devil's Canyon rig with a 980Ti that does everything I need....still! Wouldn't have necessarily stopped me before...but being a parent changes a man.
I am eager for a hopeful future 8700K or Ryzen 2 build, and already own a game or two that could take advantage of those extra cores...but I am budgeting for my server migration project which needs to get done. Been putting it off too long and just can't budget both.