CPU-Z validation of the rig, not overclocked as it's now running as a server and I need stability+low-ish power consumption: https://valid.x86.fr/v6yzuv
I bought this platform around 2009, an i7 920 D0 stepping on a Gigabyte EX58-UD3R, can't even remember how much ram or storage it had originally. I've used it as my main rig for a long time, then went to server role and it still is working as a server ~10 years later. It was overclocked from time to time, mostly for its first years, I ran it for a time at 4ghz with ht and a shorter time at 4.2ghz without ht, and probably a lot of other experiments I forget.
Ten years later I was using the 920 as a server with 24GB (8 per channel), hence no oc, and decided to give it a last push, probably its last as there's nothing to upgrade it to. Used xeons went down in price and many were moving to six cores, I didn't really need 2 extra cores as my applications would benefit more from faster cores, so I went for a Xeon X5687 which is the fastest ever on stock for the socket excepting for the ultra-rare X5689 (4ghz, only 2 cores, always at full speed, no ht iirc).
I haven't tried overclocking the Xeon for two reasons: 1) it's a server, I need it stable and I'm not usually around where it is so if it crashes its a problem, and 2) the motherboard (on latest firmware but all versions I tried seem to have issues with this xeons) takes a long time to start up and almost always claims an overclock failed (without oc applied), reverting to stock speed anyway. As it works absolutely ok once booted and it's rarely booted, I'm ok with it as it is and for the unusual scenario (maybe power outage) where it reboots/restarts while I'm not there, I've hacked together a keyboard emulator with a raspberry pi that pings the server every 5 seconds and if failed emulates an enter keypress to close the oc-failed message and continue booting up.
Everything considered, this platform is by far the best one I've had and has been with me running all the time for a full decade, around a third of my life. Of course it's crushed on single and multi thread power by newer platforms, but it can still hold its ground even today so I have a great respect for x58.