From: Bruce Markowitz (scosgt_at_worldnet.att.net)
Date: Sun Dec 08 2002 - 22:32:51 EST
That's not really true - the 486100 and the P83 could polug into the
original socket-there was a spec for an "overdrive" socket, but it neer
really came to pass, processors just moved forward too fast.
I have upgraded many 486 systems to DX100 and P83. If it boots, it works is
the general rule
----- Original Message -----
From: "Jeddy Lin" <jeddylin_at_uclink.berkeley.edu>
To: "Dennis Breslin" <dbreslin_at_ctol.net>; <100550.3170_at_compuserve.com>;
<thinkpad_at_stderr.org>
Sent: Sunday, December 08, 2002 9:41 PM
Subject: Re: [Thinkpad] IBM But not Thnkpad request
> Yes, the 486DX4 is not a 486SX -- I just didn't understand his post.
>
> Wasn't sure if he was looking specifically for a DX4-100 Overdrive for a
> speed boost or if wanted any CPU replacement that has an fpu (math
> coprocessor), since the major difference (against the DX) is that the math
> coprocessing unit is disabled on the SX. Generally, if socketed, the two
> chips are swappable as long as their external bus speed is equal. The same
> should go for the DX2 and DX4, which handle clock multiplication
> internally -- they still run at the same slower bus speed on the outside.
>
> Overdrive CPUs are designed specifically to be CPU upgrades, but I meant
> that I did not know the functional difference between the DX4 and the DX4
> Overdrive. It should be something about how Intel ran the confusing
> "Vacancy" ad campaigns (if anyone remembers) -- the original Overdrive
chips
> were not meant to be drop-in replacements for the 486SX but instead they
> plugged into their own Overdrive socket that disabled the original CPU.
> AFAIK, this was before ZIF sockets became common. However, I can't
remember
> what Intel did for the DX4 Overdrives -- if they were intended to plug
into
> the 486SX-style Overdrive sockets or if they were meant to be CPU
> replacments. And in case the chip he's looking for is a direct drop-in, I
> would be happy to pass along an old processor that I have no use for. =)
>
> Best,
> Jeddy L.
>
>
> ----- Original Message -----
> From: "Dennis Breslin" <dbreslin_at_ctol.net>
> To: <100550.3170_at_compuserve.com>; <thinkpad_at_stderr.org>
> Sent: Sunday, December 08, 2002 6:08 PM
> Subject: Re: [Thinkpad] IBM But not Thnkpad request
>
>
> > A 486SX is not a DX4 but rather a hobbled older
> > 486 chip. Mark needs to know whether the Aptiva mobo runs
> > at 20, 25, or 33 Mhz. A DX4 Overdrive will provide
> > a speed boost but limited by the motherboard's bus
> > speed. An overdrive proc may not fit in the Aptiva's
> > socket.
> >
> > Dennis Breslin
> >
> >
>
>
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