Thanks for the links Hervé! Bookmarked them!
These machines have plenty of life in them. Sure you can't watch youtuve 4k in them but you can play with a bunch of very capable software and a ton of hardware for audio that was in the hundreds of dollars is now only obsolete because most companies have decided not to update drivers. It's deliberate planned obsolescence, but the hardware that was available for these machines is now being sold for pennies and can be coupled with one of these older computers and you can keep making music. People paid hundreds of dollars for Mac computers not faster than these D620s and paid hundreds of dollars for audio hardware and recorded albums with them. You can today have it all for less than $200. Perfect for teaching audio to a student, you name it.