A technician would like to upgrade a computer and has determined the power supplied by the PSU is insufficient. Which of the following would most likely cause the insufficiency?

Replacing a hard disk drive (HDD) with a solid-state drive (SSD) generally reduces the overall power consumption of the system. SSDs are more energy-efficient and require less power to operate compared to traditional HDDs, making this change unlikely to cause power insufficiency.

Upgrading firmware is a software-related task that does not affect the power consumption of the hardware components. Firmware updates are designed to enhance system performance or compatibility without increasing the electrical demand on the PSU, thus having no impact on power supply insufficiency.

Adding an optical drive may marginally increase the power draw, but modern optical drives consume relatively low amounts of power compared to other components, such as a graphics card. This addition is unlikely to significantly strain the PSU.

While adding more RAM does increase power consumption, the amount of additional power required for RAM modules is typically minimal. The impact on the overall power requirement is usually negligible compared to that of a new graphics card.

Adding a CMOS battery does not affect the overall power consumption of the system as these batteries are used to maintain system settings and do not draw significant power during normal operation. Thus, this action would not contribute to power insufficiency.