I recently purchased two of these
memory expansions. One to go in my a4k Desktop and the other to go in my Tower. When I installed one card in my Tower it came up with an early boot error stating the card was defective. I tried both cards in the T and got the same error. When I then tried one of the cards in my desktop it worked without issue.
The setup of my Tower is as follows:
Phase 5 CyberstormPPC with Rev5 060 (unmodified) 96meg of ram.
Mediator Mark 1
With Radeon 9250 128mb (some allocated as memory)
You asked if the motherboard was over clocked. I am going to say no. Certainly this isn’t something I have had done during my ownership. Not sure how I would tell?
it had a Buster 11 chip.
There are no other Zorro cards installed.
hope this helps?