From: Jeddy Lin (jeddylin_at_uclink.berkeley.edu)
Date: Sun Dec 08 2002 - 21:41:08 EST
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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