According to the Technical Product Specification we suggest using memory with the following specifications exclusively:
-Two memory channels, four memory DIMMs (Two memory DIMMs per channel).
-Support for 1333/1600 MT/s Unbuffered (UDIMM DDR3L ECC memory).
-No support for RDIMMs.
-No support for SODIMMs.
-No support for mixing ECC and non-ECC UDIMMs
Further information can be found at the Technical Product Specification page #15: