I am not familiar with the details of the RPi family tree, but the board I am using was the first B type that went to manufacturing. It has 256K memory. The desktops that came with the early distros ran miserably slow so I tried using it as a headless mpd client. It sort of worked but there was often dropouts and/or buzzes that made it unfit for use. It was no better with music distros like Volumio and the like. It didn't want to work as a web camera server either. The USB implementation was a little wonky in some of the first boards. So, since 2011, this board mostly sat unused. Then I discovered PiHole. This board not only runs PiHole with AdBlocker but also is running a DHCP server and an NTP server for my network. Not to mention the web server for the browser interface. And it does so comfortably with an average CPU of about 33% and temperature of 48'. Finally found its calling. Just don't think about using VNC and playing with pictures. If it's not covered in the browser interface, then one needs to use ssh and the command line. Upgrading pegs the CPU at 100%, so it needs to be done during periods of light load and it does take a while. Otherwise, it just hums along doing what it does quite happily.