In most if not all power supplies since 1998 the fan(s) blow(s) from inside the psu to outside: basically it sucks the hot air from the cpu and vrm area. Early ATX psus, instead, blow from outside to inside the case as Intel though the psu fan was enough to cool its Pentium IIs: the P2 300 Klamath, considered a stove for the time heatsinks due to its 43W TDP, proved BigI was wrong
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