Mystery Chip...AMD

Mystery Chip...AMD

Post by RYAN Colin Patri » Fri, 07 Oct 1994 06:44:41



While responding to an add inteh local paper for a $99 486 upgrade it came
to light that this upgrade was a quote "486/66 Mhz" which was a "faster chip and less expensive than the i486DX2-66". This propted my query on what the hell
this chip was and the response was AMD. I was not aware of this chip. I was
under the impression that all the 66's 75's 100's etc (non-Pentium) were
overclocked 33 Mhz chips. Does a 'real' 66 Mhz chip exist? If so (and I dont'
think so" do traditional mother boards ( ie that could handle a DX2) support
this chip. And Finally, if this is true is it compatble and reliable.

INquiring minds want to know!! ;-))
Thanks...Colin
--
Colin P. Ryan
Ceramic Engineer and Computer Hobbyist           LINUX

===============================================================================

 
 
 

Mystery Chip...AMD

Post by sc.. » Fri, 07 Oct 1994 13:49:57


Quote:> While responding to an add inteh local paper for a $99 486 upgrade it came
> to light that this upgrade was a quote "486/66 Mhz" which was a "faster chip and
>  less expensive than the i486DX2-66". This propted my query on what the hell
> this chip was and the response was AMD. I was not aware of this chip. I was
> under the impression that all the 66's 75's 100's etc (non-Pentium) were
> overclocked 33 Mhz chips. Does a 'real' 66 Mhz chip exist? If so (and I dont'

The chip is manufactured (here in Austin, I might add) by Advanced Micro
Devices (AMD).  It is an internally clock-doubled 33MHz CPU, just like the
i486DX2-66.  As far as I know, there are no 'real' 66 MHz chips.  The pin-out
is identical to the Intel; it is supposed to work in Intel 486-compatible
motherboards, although from experience this is not always the case.

Quote:> think so" do traditional mother boards ( ie that could handle a DX2) support
> this chip. And Finally, if this is true is it compatble and reliable.

I am running Linux 1.1.45 on a mystery motherboard (UMC chipset) with an AMD
486DX2/66 with no problems, although my first motherboard choice (OPTi chipset)
had trouble when I upgraded the cache from 64K to 256K.  Older versions of the
chip reportedly had problems with Ghostscript, but gs (and everything
else) runs just fine on mine.  Be sure to get one with the MS Windows-
compatible logo on it; these are newer and more compatible, and you can cover
up the logo with a heatsink!

Quote:

> INquiring minds want to know!! ;-))
> Thanks...Colin

-------------------------------------------------------------------------------
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Mystery Chip...AMD

Post by G. E. Ter » Fri, 07 Oct 1994 08:19:38



: While responding to an add inteh local paper for a $99 486 upgrade it came
: to light that this upgrade was a quote "486/66 Mhz" which was a "faster chip and less expensive than the i486DX2-66". This propted my query on what the hell
: this chip was and the response was AMD. I was not aware of this chip. I was
: under the impression that all the 66's 75's 100's etc (non-Pentium) were
: overclocked 33 Mhz chips. Does a 'real' 66 Mhz chip exist? If so (and I dont'
: think so" do traditional mother boards ( ie that could handle a DX2) support
: this chip. And Finally, if this is true is it compatble and reliable.

This is just an clock doubled 33. I would say it might have been an error
in the ad. I have one of these chips. The story I read was that Advanced
Micro Devices bought the masks for the 80286 from Intel a few years back.
They decide to try to test the copywrite & patent laws by cloning the
386 & 486 chips. Well they were very successful and Intel sued. In the
following trial, Intel LOST. I hear it was due to the naming system that
they used. It made the chips generic in the eyes of the court. That is why
there is no 80586, and we have the Pentium.

As far as reliability, the AMD 486DX2/66 is an exact duplicate of Intel's
chip, or so I read in PC Magazine. And at an average of 100 to 150 dollars
less than Intel, I am a buyer!

 
 
 

Mystery Chip...AMD

Post by Mikael Nordqvi » Fri, 07 Oct 1994 18:48:52


[ Followups are directoed toward comp.sys.ibm.pc.hardware.systems as this
  has nothing to do with Linux ]

Quote:>As far as reliability, the AMD 486DX2/66 is an exact duplicate of Intel's
>chip, or so I read in PC Magazine. And at an average of 100 to 150 dollars
>less than Intel, I am a buyer!

If you are about to buy a new CPU, you might want to check out AMD's
recently released DX2/80. Goes for about the same price as an Intel DX2/66
here in Sweden.

/Mikael
--


 
 
 

Mystery Chip...AMD

Post by Brad Matthew Garc » Fri, 07 Oct 1994 20:37:54




|> : While responding to an add inteh local paper for a $99 486 upgrade it came
|> : to light that this upgrade was a quote "486/66 Mhz" which was a "faster chip and less expensive than the i486DX2-66". This propted my query on what the hell
|> : this chip was and the response was AMD. I was not aware of this chip. I was
|> : under the impression that all the 66's 75's 100's etc (non-Pentium) were
|> : overclocked 33 Mhz chips. Does a 'real' 66 Mhz chip exist? If so (and I dont'
|> : think so" do traditional mother boards ( ie that could handle a DX2) support
|> : this chip. And Finally, if this is true is it compatble and reliable.
|>
|> This is just an clock doubled 33. I would say it might have been an error
|> in the ad. I have one of these chips. The story I read was that Advanced
|> Micro Devices bought the masks for the 80286 from Intel a few years back.
|> They decide to try to test the copywrite & patent laws by cloning the
|> 386 & 486 chips. Well they were very successful and Intel sued. In the
|> following trial, Intel LOST. I hear it was due to the naming system that
|> they used. It made the chips generic in the eyes of the court. That is why
|> there is no 80586, and we have the Pentium.
|>
|> As far as reliability, the AMD 486DX2/66 is an exact duplicate of Intel's
|> chip, or so I read in PC Magazine. And at an average of 100 to 150 dollars
|> less than Intel, I am a buyer!

I heard that AMD's version is more reliable than Intel's, and that many
people have overclocked it to 80 MHz with no problems.  There was even
a rumor going around that AMD would start to sell them as 486DX2-80's.
If you see an AMD 486DX2-80 system for sale, I guess the rumor is true.
--
Brad M. Garcia                   Carnegie Mellon University
   ____/  ____/  ____/ Department of Electrical and Computer Engineering
  __/    /      __/   "The only Engineering department in the world where
_____/ _____/ _____/   the secretaries have the most powerful computers."

 
 
 

Mystery Chip...AMD

Post by Richard Sto » Fri, 07 Oct 1994 14:08:40


: i486DX2-66.  As far as I know, there are no 'real' 66 MHz chips.  The pin-out
: is identical to the Intel; it is supposed to work in Intel 486-compatible
The Pentiums come in 50, 60, 66, 90 and 100 flavors.  But anything over the
(now fairly rare) DX50 is a clock-doubled or -tripled chip in the 486 class.

--
Richard S. Stone                                             Network Engineer
The Engineering Design Group
"If it ain't broke, don't fix it!"      "If it *is* broke, pay us to fix it!"
2-FOR-1 DEAL:  "We'll break it for you and then fix it; for one low price!"

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
/* disclaimer.h */
printf("The opinions expressed above are my own, and do not necessarily
represent those of the Engineering Design Group or its affiliates.\n")
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

 
 
 

Mystery Chip...AMD

Post by Sam Bro » Fri, 07 Oct 1994 21:42:45


picked up a dx-2-80 amd, works great. $210 was my cost $320 w/green vlb
motherboard. extremely stable and fast
 
 
 

Mystery Chip...AMD

Post by Rob Ke » Fri, 07 Oct 1994 10:52:06




>: While responding to an add inteh local paper for a $99 486 upgrade it came
>: to light that this upgrade was a quote "486/66 Mhz" which was a "faster chip and less expensive than the i486DX2-66". This propted my query on what the hell
>: this chip was and the response was AMD. I was not aware of this chip. I was
>: under the impression that all the 66's 75's 100's etc (non-Pentium) were
>: overclocked 33 Mhz chips. Does a 'real' 66 Mhz chip exist? If so (and I dont'
>: think so" do traditional mother boards ( ie that could handle a DX2) support
>: this chip. And Finally, if this is true is it compatble and reliable.
>This is just an clock doubled 33. I would say it might have been an error
>in the ad. I have one of these chips. The story I read was that Advanced
>Micro Devices bought the masks for the 80286 from Intel a few years back.
>They decide to try to test the copywrite & patent laws by cloning the
>386 & 486 chips. Well they were very successful and Intel sued. In the
>following trial, Intel LOST. I hear it was due to the naming system that
>they used. It made the chips generic in the eyes of the court. That is why
>there is no 80586, and we have the Pentium.
>As far as reliability, the AMD 486DX2/66 is an exact duplicate of Intel's
>chip, or so I read in PC Magazine. And at an average of 100 to 150 dollars
>less than Intel, I am a buyer!

Actually, in the ever running catch up game between AMD and Intel the price
difference has fallen to $20.  BUT, this is about to change--BIG SHOCK!!  8^)..

AMD is about to release, yes you guessed it, their 486DX2-80MHz!!!!!

From what I've heard through my venders, It will run about $20 more than an
Intel 66MHz.

rhk

 
 
 

Mystery Chip...AMD

Post by Alexandra Griff » Sat, 08 Oct 1994 16:39:00




>I have an AMD 486DX-40.  Any news on an add-in from AMD to turn this into a
>486DX2-80, or do I need to buy a whole new chip?

Nope, sorry... the dx/2 chips are different inside (have a PLL circuit
to double their on-chip clock, and extra interface logic to hook up to
the half-speed external bus), and of course you can't very well modify
a silicon die after it's been made!

You may be able to overclock a little bit, though... possibly up to
50MHz?  That big of a jump is probably pushing it though.  Be sure to
adequately cool the cpu if you try it (heat sink w/conductive
compound, fan blowing on it).

-- alex

 
 
 

Mystery Chip...AMD

Post by iafil.. » Sat, 08 Oct 1994 18:22:48


Quote:

> I have an AMD 486DX-40.  Any news on an add-in from AMD to turn this into a
> 486DX2-80, or do I need to buy a whole new chip?

> Daniel

Yes you have to buy a WHOLE new chip.

        Arjan
-----------------------------------
     /     * _____
    /     / /     / /     / \  /
   /     / /     / /     /   \/
  /     / /     / /     /    /\
 /____ / /     / /_____/    /  \

----------------------------------
        Arjan Filius

Tell them :
        Get Linux
        Don't even think of BUYING msdos and windows.
        windows is for the masses
        Linux is for the smarter ones!

 
 
 

Mystery Chip...AMD

Post by Daniel Zappa » Sat, 08 Oct 1994 04:52:54



> picked up a dx-2-80 amd, works great. $210 was my cost $320 w/green vlb
> motherboard. extremely stable and fast

I have an AMD 486DX-40.  Any news on an add-in from AMD to turn this into a
486DX2-80, or do I need to buy a whole new chip?

Daniel

 
 
 

Mystery Chip...AMD

Post by Daniel Zappa » Sun, 09 Oct 1994 02:35:24





> >I have an AMD 486DX-40.  Any news on an add-in from AMD to turn this into a
> >486DX2-80, or do I need to buy a whole new chip?

> Nope, sorry... the dx/2 chips are different inside (have a PLL circuit
> to double their on-chip clock, and extra interface logic to hook up to
> the half-speed external bus), and of course you can't very well modify
> a silicon die after it's been made!

But doesn't Intel sell a chip that upgrades a 486DX-33 into a 486DX2-66?
How do they manage that?

Daniel

 
 
 

Mystery Chip...AMD

Post by Jay Ashwor » Mon, 10 Oct 1994 02:19:10



Quote:>I heard that AMD's version is more reliable than Intel's, and that many
>people have overclocked it to 80 MHz with no problems.  There was even
>a rumor going around that AMD would start to sell them as 486DX2-80's.
>If you see an AMD 486DX2-80 system for sale, I guess the rumor is true.

In the current Computer Shopper.  From at least 5 different vendors.
Guess it's true...

Or, maybe it _is_ a new chip.  Either way... I guess it's fast enough for
me...

Cheers,
-- jr 'Vrrrrrrrroooooooommmmmmmmmmmmmmmmmmmmm' a
--
Jay R. Ashworth       High Technology Systems Consulting              Ashworth
Designer             Linux: The Choice of a GNU Generation        & Associates
ka1fjx/4                                                       +1 813 790 7592

 
 
 

Mystery Chip...AMD

Post by Andrew Robert Ellswor » Mon, 10 Oct 1994 02:47:40


Quote:>I heard that AMD's version is more reliable than Intel's, and that many
>people have overclocked it to 80 MHz with no problems.  There was even
>a rumor going around that AMD would start to sell them as 486DX2-80's.
>If you see an AMD 486DX2-80 system for sale, I guess the rumor is true.

I've -heard- of many people overclocking Intel DX2-66's as well, and even went
so far as to contact some fellow overseas (via the net of course) who was
running his at 80 MHz.  I have a DX2-66 (SL enhanced, if that matters -- but
it still runs at 5 volts) and a clock-selectable motherboard (25,33,40,50).  
I'd -like- to be able to get a >20% increase in speed by moving a jumper, but
my main concern is the operaing temperature of the chip.  The way my MB is set
up, I have room for about a 3/8" high heat sink on the chip, but a CPU fan
blocks three of my ISA slots (excellent engineering...), so I rigged a CPU fan
to blow -across- my heat sink, which is better than nothing at all.  Unlike
my friend's P60, which will fry eggs, I can -just barely- keep my finger on my
heat sink without it getting too hot to touch.  I'm just wondering if I can
keep my chip within specs (assuming it doesn't kill it right off the bat) with
the jig-rigged cooling setup I've got now.

Anyone have any input on this?

Andy Ellsworth

 
 
 

1. Mystery chip...AMD

: Having an AMD486DX2-66, I made some tests. By overclocking it at 40
: (=80) MHz and slowing the bus accesses accordingly, I was able to
: run DOS and (more important) Linux for more than a day.
: The heatsink was quite cool.
I didn't touch the heatsink, but left my tower case open to give it
some fresh air (don't want to burn it the first week ;-))

: Why only for one day? Because when I tried to run Windows my applications
: crashed (general protection faults). And until someone will port serious
: music apps under Linux I need WinDog (sigh!), so I played for a while with
: BIOS hardware settings, and eventually I switched back to 66MHz.
My (local) bus accesses were increased up to 40 Mhz (no isa boards ;-(
and windoze worked like a charm (a friend of mine did some overclocking
too, but his video didn't work (I -> Spea Mirage, he ->Diamond Stealth 32))

: I wonder why this happens: maybe because Windows uses a broader
: instruction set than gcc? Undocumented instructions? Continuous
: real/protected mode switches? Bad programming practices?
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
                                That's for sure ;-)
: Do you think that getting a better motherboard and/or faster memory
: will help?

: My AMD CPU is quite new, so it's probably no more able to run at
: 80 MHz.
Why change a good design? Besides, mine does work.
: Alberto

: ===========================================================================
:       Alberto Vignani




: ===========================================================================

--


|                     www : http://www.cs.vu.nl/~djgroten/index.html

2. interface to IBM's MQ Series

3. Mystery Chip...AMD

4. Samovar awards for Linux and others

5. Chips & Tech 65550 driver mystery

6. where to find libX11.so.3

7. Kernel problems with AMD chips?

8. Slow Connections

9. Zeos - AMD onboard SCSI II chip -- supported???

10. AMD Chips w/ Linux

11. Gravis cards with new AMD chip

12. Zeos/AMD-SCSI chip support?

13. Running linux on an AMD chip.