Ok after some extensive looking and reading I have found my problem. In the Hardware Reference Guide for the DC5850 they state"
DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not
supported"
Looking up the serial number on the ram chips Hynix HY5PS1G431C they are a 256x4.
X4 Sdram not supported. Problem found. Guess I get to buy new ram.