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?

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...

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.

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

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

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,

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

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. 😀

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

Cheers,

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.

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.

Athlon XP 2200+ with the first revision of the 130nm Thoroughbred-A core and the fastest version of this core. Compared to the later Thoroughbred-B, the A core is very bad for overclocking and gets very hot. Maybe not often seeing today.

Here are more infos: https://www.anandtech.com/show/972/3

NostalgicAslinger wrote on 2023-03-22, 16:37:

Athlon XP 2200+ with the first revision of the 130nm Thoroughbred-A core and the fastest version of this core. Compared to the later Thoroughbred-B, the A core is very bad for overclocking and gets very hot. Maybe not often seeing today.

Here are more infos: https://www.anandtech.com/show/972/3

Hmm... are those actually rare? I have one exactly like that.

AXDA2200DKV3C AIUGA

No idea if it works though.

I remember my brother had a Thoroughbred A 2100+ back in the day... I think it's long gone now though.

EDIT: Did you look them up on ebay? Because there are lots of similar ones on there for fairly low prices.

I have two 1700s around, ordered from place back in the day that advertised "New throughbred core" and I guess had been saying that for months because I got As. But yah, higher speed should be rarer, I think I had a 2100 show up at some point. I remember they hit a wall at about 1850Mhz mine, unexceptional pallys would do 1750 so they were a whole 100mhz better than prev core.

Rarest CPU? Here's my entry for the rarest CPU. I've been looking for one (set) for over 20 years and there is none left anywhere on Earth.

Intel iAPX432.

I guess the rumors that Intel did their utmost diligence to ensure that any trace of them was removed from the universe must be true.

stamasd wrote on 2023-03-22, 22:11:

Rarest CPU? Here's my entry for the rarest CPU. I've been looking for one (set) for over 20 years and there is none left anywhere on Earth.

Intel iAPX432.

Were any main board for it ever released? It doesn't even show up on chipdb.

Personally the one that keeps me going back to check the recycle bins are:
http://www.chipdb.org/img-cyrix-5x86-133gp-4x … 3-3.6v-6566.htm
http://www.chipdb.org/img-cyrix-cx486drx2-33-66gp-3839.htm
But those are merely exceedingly uncommon these days, but can be had for $$$$.

An Intel Itanium 9760 is pretty recent but quite hard to find.

douglar wrote on 2023-03-22, 23:48:

stamasd wrote on 2023-03-22, 22:11:

Rarest CPU? Here's my entry for the rarest CPU. I've been looking for one (set) for over 20 years and there is none left anywhere on Earth.

Intel iAPX432.

Were any main board for it ever released? It doesn't even show up on chipdb.

Yes. There were complete systems using it released and in production. They were quickly axed because of horrible performance.
Here's a site that references such systems and their manuals. There are scanned copies of the manuals somewhere on bitsavers. http://www.brouhaha.com/~eric/retrocomputing/intel/iapx432/
Picture of a board: http://storage.datormuseum.se/u/96935524/Dato … m/iAPX43205.png

Ozzuneoj wrote on 2023-03-22, 20:24:

Hmm... are those actually rare? I have one exactly like that. […]
Show full quote

Hmm... are those actually rare? I have one exactly like that.

AXDA2200DKV3C AIUGA

No idea if it works though.

I remember my brother had a Thoroughbred A 2100+ back in the day... I think it's long gone now though.

EDIT: Did you look them up on ebay? Because there are lots of similar ones on there for fairly low prices.

Not really, only the newer B cores. For example one for 5€ on Ebay. I think the Athon XPs are the most common versions today, and they are not so interested for collectors. Maybe more the Athlon XP-M Barton mobile versions with 1.45V, because they are nice for overclocks.

NostalgicAslinger wrote on 2023-03-23, 17:16:

Ozzuneoj wrote on 2023-03-22, 20:24:

Hmm... are those actually rare? I have one exactly like that. […]
Show full quote

Hmm... are those actually rare? I have one exactly like that.

AXDA2200DKV3C AIUGA

No idea if it works though.

I remember my brother had a Thoroughbred A 2100+ back in the day... I think it's long gone now though.

EDIT: Did you look them up on ebay? Because there are lots of similar ones on there for fairly low prices.

Not really, only the newer B cores. For example one for 5€ on Ebay. I think the Athon XPs are the most common versions today, and they are not so interested for collectors. Maybe more the Athlon XP-M Barton mobile versions with 1.45V, because they are nice for overclocks.

the rarest has to be the 1500+ and 1900+ Palomino (i only ever seen one 1900+). In dont count OEM only parts in this.

I have a Palomino 1900+ somewhere, I doubt it's THAT rare. 😀

Warning ! Not retro (yet)!

The Xeon E5 2699Pv4 is a really really rare OEM only CPU, I have not even seen a picture.

It's pretty much a normal Xeon E5 2699 v4 but with the power restrictions lifted (145W --> 300W TDP) so the CPU can hold it's max turbo (3600 MHz) on all 22 corers.

As of yet no one seems to know who these CPUs were made for or what their intended usage were but at some point they will be retired and will end up on Chinese auction sites.