Date: Fri, 25 Jul 2003 09:40:34 -0700 From: David Allen <[EMAIL PROTECTED]>
As an example, I upgraded 2 - 8600/200s to G3 for a friend. (PowerLogix G3/400/1 meg) I had to use the 10x @ 40 mhz settings on one, as it would consistently lock up at the 8x @ 50 mhz settings. The other (and a third with an XLR8 ZIF Carrier and G3/400/512K) run perfectly at 8x @50 mhz. (The XLR8 runs great overclocked at 9x @ 50mhz, while the Powerlogix starts running considerably hotter at the overclocked 450 mhz speed.) I have had the same problem with 2 of the 6 - 7600s in my network. There are documented cases with the 8500 MoBos having this same problem. (The old 8500 list has lots of documentation.)
David, did you try moving the CPU card from the "slow" 8600 to the other one to see if it would run faster? My experience has been that it's more often the CPU card's qualities (or lack thereof) that limit the bus speed rather than the motherboard.
This is obviously difficult to get good data on, because most folks have one motherboard and one CPU card. If the combo is limited in bus speed, whose to say whether it's the MB or the CPU card, unless they have other components with which they can mix and match?
I agree that motherboards have a practicle limit on the bus speed that they support. I just think that most folks run into a limitation of their CPU card before they hit the motherboard limit, but I'm not certain of that, so I'm trying to collect data.
My experience is that my PowerLogix PowerBoost Pro adjustable 604e card will run at 62+ MHz in any machine in which I install it, which so far has include six S900s, two 9500s, two PTPs and a 7500. On the other hand, my XLR8 G3 220/100 won't run any faster than 49 MHz no matter what machine I install it in. The same motherboards that won't run the 220/100 any faster than 49 MHz, run at 57 - 58 MHz just fine with a later XLR8 350 MHz G3 card.
So, in the cases above, the limitations I ran into were due to the CPU card, not the motherboard.
Jeff Walther
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