I have an IBM Blue lighting CPU.
It works and posts fine.
The motherboard sees it as a “Cx486dx2-S @ 66mhz”
Is this a Cyrix CPU or Intel ?
What CPU setting should I use?
Cyrix or Intel ?
I am currently using Intel dx2-66 CPU settings.
2x33mhz. At 5v.
Is this okay ?
This is the later 'fake' Blue Lightning, which is just an IBM-fabbed Cx486DX2. The original Blue Lightning was an IBM in-house design, basically taking a 386 and clocking & tuning it to ludicrous mode.
No Blue Lightnings were Intel designs.
So what motherboard jumper settings should I use ?
Intel or Cyrix ?
5v. Or 3v. ?
I also have a Cyrix-DX2-66mhz.
Is this basically the same chip ?
As I said, it is an IBM - fabbed Cx486DX2.
Which is the real “Blue lighting”?
Important line from that article there:
wrote:The licensing conditions reportedly prevented IBM from selling the SLC processors on the free market. They were only available in IBM-built systems and always(?) as QFP soldered on a board.
So, anything socketed is either a chip removed from an IBM board and put on an interposer (very very unlikely) or a Cyrix chip.
Old precedes antique.
I am confused?
So what motherboard jumper settings should one use ?
Is it an IBM CPU ?
Is it a Cyrix CPU ?
Is it an Intel 486dx CPU ?
That IBM DX2 is 3.3V, you can tell by the V letter in the model code. Sort of common thing for Cyrix, TI and IBM (same design). This rule also applies to some AMD 486.
In general Cyrix design require slightly different settings due to various differences vs Intel and AMD, especially in powersaving features. It might just work but unless your mobo has official support it's not guaranteed.
wrote:This one: https://upload.wikimedia.org/wikipedia/commons/2/29/KL_IBM_486DLC2.jpg […]
This one:
http://www.os2museum.com/wp/ibm-blue-lightnin … ds-fastest-386/
Is this CPU considered a 386 / 486 or Pentium class ?
What speed did this operate at ?
And was this only put on IBM motherboards ?
If so which models ?
IBM developed the blue lightning chip shown above by modifying an intel 386. At some point they had a licensing agreement with intel to produce their chips, and got permission to make their own special version. After the agreement expired, IBM signed a new agreement with Cyrix, but they thought the Blue Lightning name sounded catchy, so they slapped it on some Cyrix DX2 chips.
The bottom line is if you have a 168 pin 486 CPU that says "blue lightning" on it, what you have is actually a Cyrix.
"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium
For a brief period of time (maybe 2 weeks) I had a 75Mhz Blue Lightning in the 90's, but I think that was the Cyrix version of a 486. It was garbage and seemed incompatible with Quake and a bunch of other games that expected a maths co pro. At the time it was essentially considered defective. I believe I replaced it with a DX2/100
This doesn't help with the voltage profile you are after, but I suspect you want to use the Cyrix profile unless its actually an IBM 386 "Blue Lightning" which seems like a different beast.
I’m like 99% sure that is a rebranded cyrix chip.
Ibm continued to use cyrix long into the socket 5 and 7 era.
As for the voltage the cyrix chips of that model (Cx486dx2-S) seem to all be around 3.3v
So you want to use 3.3v and cyrix option.
Btw, this may be of interest if you are having trouble running this.
Re: Socket 3 Tweaker
Intel486dx33 wrote on 2019-04-15, 21:26:I am confused? So what motherboard jumper settings should one use ? […]
I am confused?
So what motherboard jumper settings should one use ?Is it an IBM CPU ?
Is it a Cyrix CPU ?
Is it an Intel 486dx CPU ?
Look up the cpu part type/number at CPUWorld etc.....
