2006 was quite the year for desktop PC's
Core2 Quad QX6700 - The first consumer quad-core from intel
Nvidia 8800 GTX - The first DirectX 10 GPU, the first CUDA accelerated GPU, first GPU with unified shaders, first GPU to support 3-way SLI, first GPU with 768MB vram, first 384-bit bus-width GPU
Hitachi HDS72505 - First consumer 500GB hard drive, first consumer SATA 2 drive
SLI bridge, case/fans, PSU, and CPU cooler are new. Everything else was either manufactured in 2006 or early 2007.
It can actually runs games and use all 3 GPU's without crashing. The GPU's get EXTREMELY hot because their thermal paste has turned to dust in the last 12 years.
Despite the boot drive being from 2006, it doesn't take too terribly long to boot into Windows 10, could be faster if you used Windows 7 or Vista.
4 of the 5 drives are in a raid configuration for my Steam library and none of them show signs of dying.
I'd like to get all matching SATA cables and a case originally from 2006 in the future. However a PSU from 2006 is where I draw the line...