>on 7/13/01 10:10 AM, Tom & Lisa P at [EMAIL PROTECTED] wrote:
>
>> Depends on the CPU. The CPU card controls the bus speed. Normally,
>> the highest bus speed you are supposed to go to is 50 MHz. However,
>> if you manually disable the L2 cache via a jumper on the mobo, I have
>> heard reports of ppl going as high as 66 Mhz (although that has to be
>> rare).
>>
>> Mad Dog
>
>How do you do that?
It depends. On 604e CPUs, the bus speed is typically controlled by a
single 4 pin oscillator. Remove the part, and replace with a faster
one, and that will change the bus speed. Take note that by just
changing the bus speed, you will also change the CPU speed. For
example, if you had a 180 MHz CPU, the bus would be running at 45 MHz
(45 x 4 = 180). If you just changed the bus speed (by swapping the
oscillator) to 50 Mhz, that would push the CPU to 200 MHz (50 x 4).
The CPU may or may not be able to handle that.
You can also change the bus-to-CPU ratio on the cards,although that
varies from card to card. Typically you add or remoce a few
resistors to change the ratio.
>I haven't putzed around much with the buss settings in the MetaJoe G3/400
>that's in my S900 but I've never gotten it to go over 50 Mhz. I see people
>here routinely reporting closer to or slightly over 60...
The G3 and G4 cards are usually easier to change the bus and CPU
speed. Good cards will allow you to change them via dip swirches or
jumpers.
I honestly have no experience with the Joe cards, so I cant say what
they are capable of. I would suggest going to
www.xlr8yourmac.com and checking out the CPU upgrades database. and
see what people have to say about the Joe cards.
Have you tried to manually disable the L2 cache ?
>I also have a hodgepodge of cheap ram in this particular machine that is
>only partially interleaved and I only see 33MB/sec throughput on Guage Pro
>which I attributed to the slow bus and cheap ram.
Hmmm... that seems kind of slow. Can you take out the cheap stuff
and leave the good sticks in and see what type of throughput you are
getting ?
I really recommend getting good RAM. Its cheap these days. I would
suggest buying RAM from www.macgurus.com (KICK ASS), or if you like
ebay, I buy RAM from a guy by the handle of "ramdirect".
thanks,
Mad Dog
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