The power consumption of a QSFP (Quad Small Form-Factor Pluggable) 100G transceiver can vary depending on the specific type and design of the module. QSFP 100G transceivers are available in different categories, such as QSFP28, which is commonly used for 100 Gigabit Ethernet applications.

The typical power consumption for a QSFP28 100G module is in the range of 3.5 to 4.5 watts. However, it's essential to note that newer modules or different designs may have different power requirements, and advancements in technology may lead to more energy-efficient modules.

For accurate and up-to-date information, it is recommended to check the datasheet or specifications provided by the manufacturer of the specific QSFP 100G module you are interested in. Manufacturers often provide detailed information about power consumption, operating voltage, and other technical specifications for their transceivers.