cpu

[zapp]

i have a 486 with a cyrix dx4 100. i also have an am5x86-p75 i got from a friend. which cpu is better for my 486? and what do i have to do to install it? any BIOS setting changes?

[gooseman]

Zapp, check the specs on your current motherboard to make sure it can take the new CPU - and typically on older equip you may have to make some BIOS changes - most will automatically make all the required changes for you.

Why not move the new CPU and mother over?

G

[zapp]

Originally posted by gooseman:
Zapp, check the specs on your current motherboard to make sure it can take the new CPU - and typically on older equip you may have to make some BIOS changes - most will automatically make all the required changes for you.

Why not move the new CPU and mother over?

G

G, this is an old unit that i bought at goodwill to learn on. i don't have any specs for it and don't know who made the mb. could it be award software?
thank you for your help.........zapp

[tjaymadison]

Welcome, zapp! http://www.PCGuide.com/ubb/biggrin.gif

You need to understand some of the basic principles involved here.
These are two totally different generations of CPU architectures.

The 486 socket on the motherboard will not accept the 585/P-75 CPU.

They have completely different pinouts and voltage requirements.

Award is the manufacturer of the BIOS chip, not the motherboard.


------------------
"I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
-- Charles Babbage, mathematician, computer pioneer, analytical engine designer (1791-1871)
-- (Question: 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?')

"Just because I don't care, doesn't mean I don't understand."
-- Homer Simpson

[This message has been edited by tjaymadison (edited 05-26-2001).]

[zapp]

Originally posted by tjaymadison:
Welcome, zapp! http://www.PCGuide.com/ubb/biggrin.gif

You need to understand some of the basic principles involved here.
These are two totally different generations of CPU architectures.

The 486 socket on the motherboard will not accept the 585/P-75 CPU.

They have completely different pinouts and .

Award is the manufacturer of the BIOS chip, not the motherboard.


thank you for the info tjaymadison. OPS,to late.i put the 586 in and now the system is dead. no boot no anything. well i guess i had that comming but the whole ideas is to learn and well i learned.
ha ha ha so can i undo what i have done?
thanks.........zapp

[psabi]

Just to qualify a few things here:

The am5x86-p75 is in fact a 486 that is runs at 4x the motherboard speed of 33mhz. The p-75 denotes the pentium rated system that amd and other manufacturers used in the past. So it lacks the enhancements that a pentium has over a typical 486 but attempts to make up for it by running at a "high" speed.

Generally (and I stress generally)a socket 3 motherboard can support your 5x86 processor provided the voltage in your board can be jumpered to run at 3.45 volts. Also, your board must be running at 33mhz. Since you already had a dx4-100, you most likely have a socket 2 or socket 3 board. I've used the processor (the 5x86) but had to try about 20 different combinations among the 2 rows of dip switches on the adapter.

[Reid]

There are AM5x86 upgrade modules with a voltage converter board that is sandwiched between the AM5x86 CPU and the 486 motherboard socket. This 486 CPU Upgrade (http://web.inter.nl.net/hcc/J.Steunebrink/amd5x86.htm) link has some good info. When I used the Trinity PowerStacker, the system benchmarked equivalent to a Pentium 60.

------------------
reido@my-deja.com

Friends don't let friends install Windows ME

[psabi]

Just to qualify a few things here:

The am5x86-p75 is in fact a 486 that is runs at 4x the motherboard speed of 33mhz. The p-75 denotes the pentium rated system that amd and other manufacturers used in the past. So it lacks the enhancements that a pentium has over a typical 486 but attempts to make up for it by running at a "high" speed.

Generally (and I stress generally)a socket 3 motherboard can support your 5x86 processor provided the voltage in your board can be jumpered to run at 3.45 volts. Also, your board must be running at 33mhz. Since you already had a dx4-100, you most likely have a socket 2 or socket 3 board. (there is a one pin difference between socket2 and socket3; socket 3 boards can accept the socket 2 processors with appropriate adjustments)I've used the processor (the 5x86) but had to try about 20 different combinations among the 2 rows of dip switches on the adapter to get it to work.

Kingston and Evergreen sell the chips with the voltage converters attached for the older boards. I'm not sure what version you had. These voltage regulators were required for the older boards that only ran at 5v.

I have a socket 3 486 board that I sucessfully used the 5x86 chip with.

The whole 586 thing is a big misnomer. As for the cpu from your friend, the cpu can easily be toasted because of the lack of automatic voltage detection (not sure how many systems the processor was tried in)

This may not be a lost cause but if you do try it again and get it to work, heat will quickly become a problem (yes, even with a 4x 486!) Sink and fan...

-Pete

[tjaymadison]

zapp -- Sorry I jumped the gun with some bad info.
Didn't mean to steer you wrong. My mistake. http://www.PCGuide.com/ubb/frown.gif

All I can add is: Death to Cyrix/AMD and
their whole bogus scam of 'Performance Rated' chips! http://www.PCGuide.com/ubb/wink.gif

Click Here (http://www.amd.com/products/cpg/5x86/20030a.html) for an AMD FAQ that attempts to justify
how they can refer to an overclocked 486 as a 'P-75'.

It does have some info that might help you figure out some settings.



------------------
"I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
-- Charles Babbage, mathematician, computer pioneer, analytical engine designer (1791-1871)
-- (Question: 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?')

"Just because I don't care, doesn't mean I don't understand."
-- Homer Simpson

[psabi]

tjmad-

FYI: I meant no disrespect by my previous post - hope you didn't take it the wrong way.

-Pete

[tjaymadison]

psabi -- No problem. I should have checked more thoroughly first.

I've been burned by that Cyrix/AMD nonsense before. Should have remembered.


------------------
"I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
-- Charles Babbage, mathematician, computer pioneer, analytical engine designer (1791-1871)
-- (Question: 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?')

"Just because I don't care, doesn't mean I don't understand."
-- Homer Simpson