Samsung 4GB (1x 4GB) CL9 DDR3-1333 PC3-10600 1.5V ECC 240-pin EUDIMM RAM Module Model_Mac_Book_Pro_9_1 x4 configuration RAM kit is

x4 configuration RAM kit is for use in DDR4 compatible systems and operates at 2133 MT/s with an overall transfer rate of PC4-17000

but the effective rate is 667 megatransfers per second (MT/s) because there are 333 million rising edges per second and 333 million falling edges per second of a clock signal running at 333 MHz

M386A8K40BM2-CTD Capacity 64GB (1x 64GB) Brand Samsung Speed DDR4-2666 - 2666MT/s - PC4-21300 Voltage 1

2xMTA16ATF2G64AZ-2G1B1 Capacity 32GB (2x 16GB) Brand Micron Speed DDR4-2133 - 2133MT/s - PC4-17000 Voltage 1

Samsung 4GB (1x 4GB) CL9 DDR3-1333 PC3-10600 1.5V ECC 240-pin EUDIMM RAM Module Model_Mac_Book_Pro_9_1 x4 configuration RAM kit isProduct Overview Dramatically improve performance and handle larger user and application workloads in your mission critical workstations and servers with this 4GB (1x 4GB) DDR3 1333 MT s 240 pin EUDIMM RAM module from Samsung . This RAM module is for use in DDR3 compatible systems and operates at 1333 MT s with an overall transfer rate of PC3 10600. This RAM module also operates at a standard voltage of 1. 5V with a CAS Latency of CL9, and is designed