Digital Equipment Corporation
I had a couple Digital Equipment Corporation (DEC) Alpha bare motherboards I bought off eBay. Unfortunately they arrived in terrible condition and didn't last very long. Alphas were my first 64-bit CPUs and DEC played the MHz game to the hilt. Alpha was also the first Windows NT port off Intel as well as running DEC's own OpenVMS and their Ultrix POSIX OS. The Multia, in fact, arrived with Ultrix install media but no hard disk drive. Re-homing the motherboards with appropriate support hardware and installing Linux was relatively easy as Alphas were a popular target at the time. Unfortunately neither board lasted through or much beyond the OS install. Eventually I gave up on getting a decent Alpha as availability declined and prices increased. I ended up stripping the RAM and recycling the hardware.