64gb PC3-14900R 1866 RAM upgrade 4 x 16gb for Apple Mac Pro Late 2013 6,1 A1481
64gb kit (4 x 16gb) DDR3 PC3-14900R 1866mhz ECC Reg RAMs. And all motherboards which support 4 x 16gb PC3-14900R ECC Reg DIMMs. I'll confirm which spec RAM you need, and whether I have any.