Hi Paul,
Have you tried the C2 connected to the on-board SCSI port of the E4500. This would be the one that is built into the I/O board, not the add-on one that you mentioned is Differential.
BrewDudeBob,
I was very impressed with their RAM price as well, so I wrote to them to ask if the RAM is Sun Original or Third Party. (see their reply at the end of this post)
If I'm not mistaken, the RAM associated with any specific processor will be mapped out of memory. . . so both answers are right. Under this theory, there may be 16GB of RAM physically installed in...