The PowerMac's (7xxx,8xxx,9xxx) basically max out with a 50Mhz bus. Some early third party CPU cards (the CPU card actually sets the bus speed in these machines) pushed that up to 60Mhz, but didn't have a big effect. The cause is that the memory used (60ns EDO) basically maxes out at 50 Mhz access speed and all that happened when memory was accessed is that an extra wait state was added. Power computing introduced a clone with a 60Mhz bus speed, but I don't know what modifications they made to support it. The thing with bottle necks, you really need to know what the bottle neck is and then how much of an improvement you can make until you hit the next one up the line. I always loved the one person who put in an early ATA-100 PCI card and hooked his ATA-100 HD up to it and did not see any performance improvement. The reason? The HD, although an ATA-100 interface, was a 5400 RPM drive with a 13ms seek time and 512K of RAM - basically a low end drive - and was badly fragmented at that - so the drive was the actual bottle neck, not the interface speed.
>Hi, I'm new on this list. Could someone point me in the right direction >to instructions for overclocking the system bus on a PM 7500? I've >heard of overclocking the system bus, and I think it might relieve the >bottleneck in my computer (500MHz ZIF upgrade w/ ZLR8 Carrier). Is it >even possible? -- -- Mr. PopMan - [EMAIL PROTECTED] - "Does anybody want to play a game of pinball?" Change is inevitable - The struggle is optional. -- 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:pci-powermacs@;mail.maclaunch.com> To unsubscribe, email: <mailto:pci-powermacs-off@;mail.maclaunch.com> For digest mode, email: <mailto:pci-powermacs-digest@;mail.maclaunch.com> Subscription questions: <mailto:listmom@;lowendmac.com> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
