Hello,
I am sure we can get to the bottom of this issue, but can you give me a little more information about your original system.
How old are the Optiplex computers, and do you know if they ran on a 5 volt or 3.3 volt PCI bus.
What Revision is the PCI-6071? This should be on the board.
If you can't find that let me know
When were the PCI-6071 cards purchased? If you see a serial number (number on a label with a barcode) on one of the boards you could just tell me that.
Right now I think it probably has something to do with the PCI voltage bus changing, but if you can get me this information I will be able to make sure that is the case. Please get back to me with this info and any other information you think might be important so I can stay on top of your issue.
Have a great day,
Michael