PowerEdge T20 with One Intel Xeon processor E3-1225v3 memory

wow just talked to dell they said work fine, also read this online

There are three types of DDR 3 memory support by the 12G PowerEdge systems: Unbuffered DIMM (UDIMM), Registered DIMM (RDIMM), and Load Reduced DIMMs (LRDIMM). These DIMM types cannot be mixed in a single system, you must select the type of DIMM appropriate for your workload at the time of purchase.

UDIMM is an unbuffered, low density, low-latency DIMM that doesn't include a register or buffer chip. UDIMMs are generally used in applications requiring the lowest possible latency

RDIMM is a registered DIMM that provides high signal integrity -- performing parity checking to detect improper addresses or commands -- and increased performance for heavy workloads. RDIMMs experience slightly increased performance for heavy workloads. RDIMMs experience slightly increased latency and power consumption over UDIMMs due to the onboard register. 

LRDIMM uses a buffer to reduce memory loading to a single load on all DDR signals, allowing for greater density.

The following table lists the memory types supported by the new PowerEdge servers.

yes i have seen it both ways in dell literature, I see how you came to that conclusion, the tech guy on phone said work fine, hope to fire it up thursday or friday will let you know.  Thanks for the help

curiosity got me fired it up, you are correct, fires up fine on the unbuffered not the registered. thanks again