ASROCK X58 Extreme6 Manual De Instrucciones página 15

Please be noticed that this motherboard supports Combo Cooler
Option (C.C.O.), which provides the flexible option to adopt two
different CPU cooler types, Socket LGA 775 and LGA 1366. The
white throughholes are for Socket LGA 1366 CPU fan.
ASRock X58 Extreme6 Motherboard
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