🚀 go-pugleaf

In article: <EwSt1CAiJUfxEwnT@triffid.demon.co.uk>  "Max D. Wilkinson" <max@triffid.demon.co.uk> writes:
> >P75  > P90  100%
> >P75  > anything above P90 0%
> >
> >P100 > P133 100%
> >P100 > P150 & up 0%
> >
> >P133 > P150 only if you use 50Mhz bus clock and x3 internal multiplier
> >P133 > P166 & above 0%
> >
> Always considered this a silly thing to do...
> but now my P90 is at 100mhz ok. Hope I'm not going to get too many bad 
> habits from you lot.
> 
> Any one have a theory on the difference between motherboard settings, 
> specifically a 66mhz @ 2-3 giving 99mhz or a 50mhz @ 1-2 giving 100mhz
> i.e. bus speed with a pci system, ide HD controller timings, video etc..
I think that it works for many people, provided that they go in with their
'eyes-open', ie. prepared to take the chance. It incurs some risks, but in
some cases, is only a case that the chip was not tested at the higher rate.
What worries me, is people pushing a chip well beyond it's manufacturers
figure, or without realising that this does involve the generation of more
heat, and the chance that the chip may fail at a critical time, when a
large amount of important data is being dealt with. It is also important to
realise, that with traditional semiconductor technologies, the actual
failures may only occur at higher ambient temperatures, and a chip may
well perform perfectly in the winter, but 'fall over' unpredictably in the
summer months. What does worry me far more, than the 'home user'
pushing a chip by 10%, is companies actually deliberately marketting
such chips, and hidding the fact that they are doing so.
Pushing the 'bus speed' significantly higher, increases overall performance,
but also increases the problems, with more heat from all the ancilliary parts,
and also more problems with support chips, and an increase in errors
from poor termination of lines on the motherboard etc.. It is very salutory,
to realise the problems that 'brand-name' manufacturers had, trying
to get motherboards reliable with the bus at 50MHz, on the 486 DX50
machines, and the way that the bus rate has remained stationary at 'only'
30/33MHz, even on the new 180/200MHz processors.

Best Wishes

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