Lenovo ThinkStation C30 and D30 Heatsink (0A65721)
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What is a Heat Sink?
Supermicro 2U Active CPU Heatsink for Socket LGA1150/1155 – MITXPC
Heat sink - Wikipedia
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Understanding CPU Heatsinks: Picking the Best CPU Cooler | GamersNexus - Gaming PC Builds & Hardware Benchmarks
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