First post, by harddrivespin
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Would a 486SX 25mhz require a heatsink and fan?
Reply 1 of 4, by cj_reha
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No, unless you really want to keep it cool.
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Reply 2 of 4, by Jo22
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486DX2-66 was about the borderline.
(Don't know ift that's also implying the 486DX50, though - never had one.)
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Reply 3 of 4, by SW-SSG
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I once found a Dell with a 486SX-33 (ceramic). No HS or fan; the PSU fan was the system's only fan (and was located all the way on the other side of the case from the CPU socket). It worked just fine.
Reply 4 of 4, by jesolo
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It won't do any harm to just add the heatsink (you can remove the fan to reduce noise and therefore just have passive cooling).
But, the 486SX-25 never came out with a fan or heatsink and it was also not a requirement by the manufacturer.