Tried each card in each different Mac with the same speed/lockup problems being machine specific vs CPU specific. I now use a known good at 50mhz XLR8 ZIF carrier with G3/400/1 meg to test all new Macs for upgrading. I find about 1 of each 3 Macs tested to be incapable of reliable 50 mhz use. As I stated, this phenomenon is well documented at the 8500 list site and was a commonly recurring thread on that list. This is after upgrading a few dozen 7500/7600 and 8500/8600 series Macs.
I have seen some upgrade cards that were unreliable at higher bus speeds, (Mostly some early Sonnett cards) but usually that was a limitation of the G3 CPU on the card. Good quality CPU chips work at well beyond 50 mhz, just as some G3 CPUs work with the L2 cache set higher than stock and others won't allow any over clocking. David Allen > > > 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 > -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
