VOGONS


Rarest CPUs?

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Reply 320 of 330, by debs3759

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rmay635703 wrote on 2022-11-23, 04:51:

Why were some dx2’s just labeled overdrive with only a bus speed and no “speed rating”

No idea 😀 Maybe they showed what you could replace with them?

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 321 of 330, by H3nrik V!

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debs3759 wrote on 2022-11-23, 08:35:
rmay635703 wrote on 2022-11-23, 04:51:

Why were some dx2’s just labeled overdrive with only a bus speed and no “speed rating”

No idea 😀 Maybe they showed what you could replace with them?

Exactly why. Since the Overdrives were targeted for non-tech savvy people, Intel probably believed that it would be easier for the average consumer to buy the right part...

Please use the "quote" option if asking questions to what I write - it will really up the chances of me noticing 😀

Reply 322 of 330, by Sphere478

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TrashPanda wrote on 2022-11-23, 07:18:
BitWrangler wrote on 2022-11-22, 01:44:
Sphere478 wrote on 2022-11-12, 17:49:
In my experiments there is only one socket 5/7/ss7 cpu that could reasonably potentially be run without a heatsink and that’s a […]
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In my experiments there is only one socket 5/7/ss7 cpu that could reasonably potentially be run without a heatsink and that’s a tillamook. (Under specific low volt/clock settings)

But a 2+/3+ is a close second.

I in fact have run a tillamook for some time without a heatsink.

Underclocking and undervolting help a lot

Some of the later production P75-P100 ceramic barely need one @ 3.3V unless you wanna get 133-166 out of them of course. I think some of the split plane WinChips will just do it too.... It's all a bit "depends" on case ventilation and ambients.

I have one of these 2.9v Pentium 90s, not sure itll even need a cooler as it barely gets warm when running.
Low Voltage P90.jpg

Oh wow. Very nice!

A mobile no doubt? I don’t think I have that one yet. Gotta up my early pentium game.

Sphere's PCB projects.
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Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
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Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 323 of 330, by rmay635703

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Sphere478 wrote on 2022-11-23, 16:56:
TrashPanda wrote on 2022-11-23, 07:18:
BitWrangler wrote on 2022-11-22, 01:44:

Some of the later production P75-P100 ceramic barely need one @ 3.3V unless you wanna get 133-166 out of them of course. I think some of the split plane WinChips will just do it too.... It's all a bit "depends" on case ventilation and ambients.

I have one of these 2.9v Pentium 90s, not sure itll even need a cooler as it barely gets warm when running.
Low Voltage P90.jpg

Oh wow. Very nice!

A mobile no doubt? I don’t think I have that one yet. Gotta up my early pentium game.

And it’s socket 5 but dual voltage

Wonder what date code that is?

I remember it was a big deal when the first small portable Pentium laptops arrived in a speed other than 75mhz. (For the longest time the only pentium laptops were 75mhz)

You could get gigantic 90mhz+ laptops before that but the gigantic battery only lasted an hour

Reply 324 of 330, by Sphere478

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Wait, that’s dual voltage? Are you sure?

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 325 of 330, by pentiumspeed

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I have a pentium 90 in TCP package on a adapter to fit into socket. Also 2.9V. Does works in dual voltage plane boards even FX chipset if it has socketed VRM and later boards as well.

Cheers,

Great Northern aka Canada.

Reply 326 of 330, by TrashPanda

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Sphere478 wrote on 2022-11-23, 21:52:

Wait, that’s dual voltage? Are you sure?

Yup, specs are

SPGA Socket 7
2.9v Core
3.3v I/O

Oh noes, the cap let the shmooo out 😁

Reply 327 of 330, by Sphere478

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Very nice. I had thought mmx was the first. Thanks for the enlightenment.

pentiumspeed wrote on 2022-11-23, 22:26:

I have a pentium 90 in TCP package on a adapter to fit into socket. Also 2.9V. Does works in dual voltage plane boards even FX chipset if it has socketed VRM and later boards as well.

Cheers,

Doesn’t mean it is a dual plane. Single plane cpus work in socket 7 in fact some socket 7 boards only had single plane voltage supply. (Dumb, I know) but pretty cool that these chips appear to be dual plane. I’d like to get my hands on one eventually. 😀

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 328 of 330, by pentiumspeed

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Yes, dual plane for sure, I tested this long ago, still have the processor. I confirmed with this Pentium 90 2.9V.

Cheers,

Great Northern aka Canada.

Reply 329 of 330, by TrashPanda

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pentiumspeed wrote on 2022-11-24, 01:34:

Yes, dual plane for sure, I tested this long ago, still have the processor. I confirmed with this Pentium 90 2.9V.

Cheers,

Can also confirm its a dual plane CPU !

Its a neat little thing that I need to find a suitable mini dual plane socket 7 board for along with a tiny AT case.

*I have a Zida Tomato TX100 board that I need to check if its dual plane, its the perfect tiny size I want. It had a K62 333 in it so I see no reason it wouldn't be dual plane, its also jumperless which bodes well for it being one of the better boards.

Oh noes, the cap let the shmooo out 😁

Reply 330 of 330, by Scraphoarder

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Intel has made some CPUs for special tasks such as high performance computing where clockspeed was important.
LGA 1366 Westmere EP based Xeon X5698 4.4GHz dual core was released in February 2011 to selected customers with a price tag of approx $20K. Maybe not extremely rare, but still expensive to buy used.