What is the purpose of the I/O shield supplied with a motherboard?
Align and protect rear motherboard ports
The I/O shield is a thin metal plate supplied with the motherboard that snaps into the rear opening of the computer cabinet.
It has cut-outs shaped to match the board's rear connectors (USB, LAN, audio, HDMI, etc.), so it aligns those ports with the case opening and covers the gap around them.
This keeps dust and debris out, provides EMI shielding and mechanically protects the rear port cluster; it does not cool the cabinet, speed up the processor, or cover RAM slots.
Hence, the answer is align and protect rear motherboard ports.
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