Seems to indicate that the Release Candidate 3 builds for Alpha never made it out through official channels. I'm pretty sure beta and RC was one disc per flavor and architecture though: so x86 professional, x86 server, etc, and alpha pro/server/etc. A big bundle of discs would come from Redmond.
I know nt4 had all the archs on the release disc, but I don't think that was the plan for win2k
Mostly used a DEC Alpha as a "visible" competitor to our major server provider at the time (Compaq) to try and manage the prices they were charging (at least until Compaq bought Digital, and then eventually bought by/merged with HP).
One interesting thing was that we had a faulty RAM chip that we only discovered due to a bug in website publishing to IIS causing a big memory leak which crashed the server. Once the the chip was replaced, we still had the underlying leak - but at least the server didn't crash any more.
A company in Ireland I worked for gave a mobile phone GIS demo to the Irish national phone company and Digital lent us a beefy server with two AXP CPUs (it was gonna be the future!) running windows NT. We literally pulled it on cobbled dublin streets on a a handcart to bring it to their offices.