On Thu, 27 Jul 2000 14:12:27 -0500, Clarence Verge wrote:
> Steven wrote:
>> Pete wrote:
>> >
>> > I gather, then, that the correct FPU would be a Cyrix 80387?
>> > 40MHz is listed as top speed for that.
>> If your CPU is a 486DLC-40, then any 40MHz 80386 should work.
>> I don't think Intel made a 40MHz version, but perhaps AMD did?
>> I wonder what would happen if you used a 33MHz copro.
>> *** Does anyone have any experience overclocking copros? ***
> Just to clear things up a bit, the 80386 replaces (and downgrades)
> the CPU - not the copro. You need an 80387 for that socket.
> I have an Intel 80387DX-25 as spare here but that's a bit far off.
> No.
>From the mobo manual (verbatim):
---------------------
* Uses Intel, AMD, Cyrix 80386DX running at 25/33/
40MHz, or uses Intel 80486SX running at 20/25/
33MHz, or 80486DX CPU running at 33/50MHz, or
80486DX2 running at 50/66MHz
* Uses Intel, Cyrix 80387 running at 25/33/40MHz.
Uses AMI BIOS: 27512-20 (1)
* Uses UMC chipset
* 8.33/10/12.5MHz bus speeds (for 80486-50)
(etc., etc...)
"Note that when upgrading the CPU, you must also change the osillator."
386DX-25, 50; 386DX-33, 66; 386DX-40, 80
486SX-20, 40; 486SX-25, 25; 486SX-33, 33
486DX-33, 33; 486DX-50, 50
486DX2-50, 25; 486DX2-66, 33
-----------------------------------
I think my best "mfg reccommended" option is to drop the oscillator to
33Mhz and replace the CPU with a 486DX2-66.
NB: The CPU currently on the board is not in the list above.
- Pete Randolph -
- Morristown Corners, Vermont -
