A 2008 build that features the first generation of Intel i7 CPUs based on socket LGA 1366 and triple channel RAM. In 2014 I've upgraded the GPU and added a SSD. The original OS was Windows Vista Ultimate, but since then the build has seen Windows 7 and it's now running on Windows 10.
After 11 years this relic still rocks and, honestly, as much as I like build theorycrafting, I don't feel the urge to buy a new PC yet.