What is this mysterious metal thing on my motherboard

Solution
That is the VRM cooler if I understand what you are saying correctly.

It is a heat sink for the powersupply that provides the low voltages the CPU needs. Converts 12V input down to 1-ish volts the CPU runs on.

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That is the VRM cooler if I understand what you are saying correctly.

It is a heat sink for the powersupply that provides the low voltages the CPU needs. Converts 12V input down to 1-ish volts the CPU runs on.
 
Solution


No, it cools the motherboard, not the processor. It is passively cooled, so no fan is attached. you are thinking of the CPU heatsink. That has a fan on it.