Ans:DDR3 1333 registered or un-buffered ECC.
NOTE. Memory speed will depends on the Intel Xeon 5500 and Xeon 5600 series processor as the memory
controller is integrated in the processor itself. Not all Intel Xeon 5500 and Xeon 5600 series processors can
support 1333 MHz
NOTE. Memory speed will be down from 1333 MHz to 1066 MHz if there are 2 DIMMs installed per memory
channel with the processor that supports 1333 MHz. This is the limitation of Intel Xeon 5500 series processor as
the memory controller is integrated in the processor itself.