In a message dated 9/9/03 8:30:32 AM, [EMAIL PROTECTED] writes: << I just pulled the NewerTech G3 300 card from my 8500 and put it in my 8600. It seems to be working fine. However, Apple system profiler shows it as a 8500 and running at 279 Mhz. Gauge Pro shows it running at 302.1 Mhz. >>
The NewerTech cards use a master oscillator and a phase locked loop to obtain: 1) the bus speed, 2) the cache speed, and 3) the CPU speed. These are all related to each other by certain multiples, some of which are programmable. In order to reliably work in a 50 MHz bus machine, such as the PCI PowerMacs, NewerTech was forced to use a bus speed which was somewhat lower than 50 MHz. Usually 46 and a fraction MHz or 47 and a fraction MHz or 48 and a fraction MHz. Example ... With a 400 MHz CPU and a 7.5 multiplier, the bus speed would be 53.33 MHz, which is too fast for most machines, although it would work in some. So, NewerTech usually substituted a 47 MHz bus speed and an 8 multiplier, which gets you to 376 MHz. (The cache speed is always a sub-multiple of the CPU speed; but all are actually derived from the bus speed). In your case, the card is probably running the 300 MHz processor with a 6 multiplier and a 48 and a fraction MHz bus, thereby giving 279 MHz. The same trade-offs are present in most NewerTech products, and in many other vendor's products as well. Apple's cards are usually designed to work at full rated speed, both as to the CPU and the bus. -- 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
