FCM 16GB DDR3 DIMM PC3-14900 1866Mhz with ECC reg.

 DataWorld item No.: MP/16GB/149ER

FCM 8GB DDR3 DIMM PC3-14900 1866Mhz with ECC reg.

 DataWorld item No.: MP/8GB/149ER

OWC 64GB Kit (4x16GB) DDR3 DIMM PC3-14900 1866Mhz

 DataWorld item No.: OWC1866D3R9M64