A passive heatsink

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ATX Slot 1 Pentium 3 Motherboard with a passive (no fan) heatsink attached to the processor

ATX Pentium III Slot 1 motherboard with a passive (no fan) heatsink attached to the processor.

If the image is too dark, use your monitor's brightness control to make it clear. The processor is on the right with Intel indestinctly printed on it, and the heatsink is the large black object attached to it.