Anyone using an Intel AboveBoard MC on a Model 80?

[Sridhar Ayengar]

Curtis H. Wilbar Jr. wrote:
> Cameron Kaiser wrote:
>>> I *love* 486DX-50 machines.  I've had some success in the past 
>>> installing Am5x86-133 chips in these machines running at 200MHz.
>>> 
>> 
>> What did you change on the board to get the 200MHz speed? I have a
>> -133 here that I'd love to try that on.
>> 
>> 
> My guess is he is running the front side bus at 50mhz (as genuine
> DX50 systems do) vs the 33mhz fsb that the Am5x86-133 is designed for
> (33.3*4 = 133, 50*4 = 200).

Exactly.

> I wouldn't have imagined that part would handle a 50% overclock.  I
> have not found many processors in my limited overclocking experience
> that exceed 20% overclock w/o fiddling with "excessive" cooling,
> increasing core voltage, etc.

Considering that the Am5x86 ran reasonably reliably with no heatsink at 
all, running with a minimal heatsink and fan, it's not that big of a deal.

> I have been running a 2.4 Prescott P4 at 3.0Ghz... but once in a
> while until it is warmed up it will blue screen and reboot.... so
> I've backed it off to 2.8 to see how it goes....  I'm wary of jacking
> the core voltage... (although it isn't a northwood so I don't have to
> worry about SNDS).  I may inherit some 2.8GHZ Prescott P4s with
> 800mhz fsb (vs the 2.4/533 I have now OC'd to 2.8)... so may go with 
> one of those :-) (plus they have HT (woo... moan...).

Back then, processors weren't so high-strung from the factory.

Peace...  Sridhar