|One of the units which you describe as using RIMM memory uses memory generally called RDRAM. RDRAM must be used in pairs and all memory slots must be filled with either RDRAM or Continuity-RIMM (CRIMM), also known as terminator or dummy modules. |
That type of RAM is fairly expensive. Add the cost of a hard drive and a copy of Windows and that unit is not cost effective, IMO. If you find used RDRAM and CRIMMS then is MIGHT make sense. Se the link below for more on RDRAM.
What you evidently have are someones castoffs. As such the original owner didn't think they were worth anything and that is how you should treat them.
The Second unit is not quite as bad but still posses the same basic expenses.
Keep in mind that you don't knwo if these units will work even if you install RAM and hard drives. You will still have very old technology.
I recommend you put these on the side and wait to pick more hardware off the curb to make complete computers. Then you could install some version of Linux for free and the deal makes sense.
BTW, you still need monitor, keyboard, mouse, etc.