Pre proper cooling tech eh? I think there were even clip-on co processors weren't there? Cyrix rings a bell?
It was long time ago, but I think 75 MHz Pentium even could more or less work without a heatsink at all.
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486 could, Pentium could not :)
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It was long time ago, and memories could lie to me, but I kinda remember running 75 MHz Pentium without any heatsink. And 486 vs P5 should not be a difference, heat is mainly from MHz, not CPU generation.
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...so long as you didn't press the turbo button
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