>On Wednesday, April 10, 2002, at 03:00 , (Unsupported OS X) wrote:
>
>> Hi again,
>> Well, after some experimentation, I have managed to get the card to
>> run at 250MHz under OSX, on the 45MHz bus speed. So, I'm still quite a
>> bit
>> better off than with the 604e processor. I'm quite happy with the
>> performance of the machine & it appears to be quite stable & hasn't
>> had a
>> kernel panic thus far, so things seem to be good - If anyone has any
>> secrets to getting it to run faster than this under OSX, please post it
>> to
>> the list.
>>
>>
>> Bye for now, Terry Allen
>>
>>
>
>I can't remember the maker of the card, if it is from Sonnet then there
>is not much you can do about tweaking your speed on the card. The other
>cards usually allow you to over clock the chip on the card and/or the
>system bus, XLR8 does this nicely.
>
>The 7300 has a top rated system bus speed of 50Mhz, and if your card
>allows you to change the system bus speed, you are set. This is the
>safest way of increasing the effective speed of your 7300, from 250Mhz
>to 277Mhz.
>
>Two other ways to speed things up is to adjust the multiplier of the G3
>chip. A lot of cards use the same CPUs but clocked lower, ie. most G3s
>are rated at a multiplier of 8,9 or 10 and yours is set to 5.55555555.
>There are a few utilities that will tell you the chip you are using, IBM
>or Motorola and it's model number. You can check the tech notes on the
>respective web page. The next way is to increase the speed of the
>backside cache through the respective software you are using if it is
>capable of doing the job.
>
>Check out 'Accelerate Your Mac' (www.xlr8yourmac.com), they have some
>very good articles on G3 upgrades and links.
>
>-----
Hi there,
Thanks for your reply - the card is a Powerlogix Powerforce G3/400
I've been trying various bus speeds & the absolute best I've been able to
achieve is 260MHz on a 45MHz bus. I have tried leaving the multiplier at
the same rate & changing the bus, but on the Powerlogix chart in the
manual, it's virtually a diagonally straight line for the card working
under OSX as follows:
40MHz bus - 260MHz processor
45MHz bus - 247MHz processor
45MHz bus - 225MHz processor
46.7MHz bus - 233MHz processor
50MHz bus - 225MHz processor
Under OS9.1, the card runs at 400MHz on the 50MHz bus with no
problems. Does anyone know why OSX has a problem with the different CPU
speeds & the bus speeds - is it some sort of dependency on the bus speed
that lets OSX run?
Bye for now, Terry Allen
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