Memory Compatibility

Correct Answer: Both RAM modules are running at the lower speed of 1333 MHz.

When installing RAM modules of different speeds, the system will default to running both modules at the speed of the slowest module. In this case, with 1600 MHz and 1333 MHz modules installed, both will run at the slower 1333 MHz speed. The other answers are incorrect because the laptop does support mixed-speed RAM (it just runs at the slower speed), and the slot placement does not affect the speed at which the RAM operates.

Correct Answer: Purchase an additional 32GB DDR4 3200MHz memory kit

Purchasing an additional 32GB DDR4 3200MHz memory kit is the best solution in this case, as it matches the system's current memory type, speed, and capacity. The other options either downgrade the overall speed, change the memory type (DDR3), or don't achieve the desired total RAM of 64GB.

Correct Answer: Replace the DDR4 modules with DDR3 modules

DDR3 and DDR4 modules have different notches on their connectors and are not physically or electrically compatible. The technician should replace the DDR4 modules with DDR3 modules to resolve the issue. Forcing the modules, bending pins, or trying to change BIOS settings will not solve the incompatibility.