Thanks Tom,
Called support and we got it worked out. Had to go to Dell web site and found the info.
I was looking for a Symantec or Dell 8260 device while the one we have is really a 1850 model. A bit confusing as it still says 8260 on the front.
All's well and it is PC2-3200 ECC registered memory (DDR 2-400) for anyone else looking.