Question on Pentium 133 CPU Fan and Heatsink

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Question on Pentium 133 CPU Fan and Heatsink

Postby tegrady » 2018-1-28 @ 20:13

Hi, I just bought this motherboard/CPU/RAM combo off of eBay.

It includes a Pentium 133. I took the heatsink off the CPU and noticed that there is no thermal compound. The copper colored part on the bottom of the heatsink feels like plastic.

The copper colored plastic piece has left a discoloration on the CPU itself.

Should I add thermal compound? Should I try to remove the copper colored thing and add thermal compound? Should I get a new heatsink?

If I need a new heatsink, what is a good heatsink with fan for a Pentium 133?

Thanks.
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby derSammler » 2018-1-28 @ 20:16

That's fine, you don't need any thermal compound. That "copper colored plastic" is a thermal pad. As long as it's clean, you can keep using it.
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby tegrady » 2018-1-28 @ 21:44

Thanks!
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby appiah4 » 2018-1-28 @ 21:45

As long as the thermal pad is intact you don't need additional thermal compound, but I find that pad tends to hard-stick onto the cpu and get ripped off at least partially in most cases, so I just scrape it off completely and use a decent thermal compound instead.
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby dionb » 2018-1-28 @ 22:57

This is a Pentium 133 we're talking about and those things were - by modern standards - very cool parts. TDP was 11.2W, but typical dissipation was closer to 4.3W. You frequently saw them with a heatsink similar to or smaller than the one in these pictures and no thermal compound, pad or other thing to ensure a good fit, but that was good enough.

This pad looks in remarkable order given its age. Yes, scraping it off, cleaning both surfaces first with white spirit, then with meths, then applying a few tiny blobs of good thermal compound will ensure better thermal contact, but will not in any way improve lifespan (it's survived for over two decades like this already...) or even noticeably affect temperatures.
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby Radical Vision » 2018-1-31 @ 13:21

It will be ok like that, as the processors on that era did not heat too much.
That Pentiums have even smaller box coolers, your is 5 times bigger..
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby brostenen » 2018-1-31 @ 14:38

I have seen P166 with passive heatsink, wich did not even have a thermal pad. It was a big heatsink though. Like 3 centimeters tall.
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby Tetrium » 2018-1-31 @ 18:02

brostenen wrote:I have seen P166 with passive heatsink, wich did not even have a thermal pad. It was a big heatsink though. Like 3 centimeters tall.

Did it also have a pretty anodized color? :P
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Re: Question on Pentium 133 CPU Fan and Heatsink

Postby FFXIhealer » 2018-2-01 @ 02:20

I have a Pentium 200 (non-MMX) CPU that used to have a passive heatsink on it. No thermal pad, no paste. Looked like some kind of automobile tower. I replaced it with an aluminium heatsink and an attached fan that has a thermal pad on it. Works extremely well for the system.
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