In a message dated 3/24/02 2:53:00 AM, [EMAIL PROTECTED] writes:
<< An Apple 604e CPU card is a Mach V if and only if its speed is 250 MHz or greater, the fastest being 350 MHz. Motherboards that came with slower cards are incompatible with Mach V cards, and vice versa. What's different about the Mach V is that it has an "inline cache". I1m not sure how such a cache differs from the backside cache on the G31s/G41s, but it is on the CPU card rather than the motherboard. >> Mach5 CPUs are 604ev's. Mach5 CPU cards have lots of logic, including a large inductor for the CPU's power supply regulator, on the back of the card (this regulator is a lot like that seen on a separate card on Beige G3s). The cache is on the CPU card itself and runs at 100 MHz. This frees the Mach5 motherboard from having to support cache accesses (and there is no cache card socket on Mach5 motherboards), and this increases overall performance. In order to facilitate the cache being on the CPU card, and to support cache coherency, some of the signals on the CPU card connector are changed. This last change prohibits non-Mach5 cards from working in a Mach5 motherboard. IIRC, Mach5 8600s were 250 and 300 MHz; Mach5 9600s were 250, 300 and 350 MHz. -- 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! | PowerON Computer Services <http://www.poweron.com> REPLACEMENT PARTS in STOCK Drives, CD-ROMs, RAM, Mac OS SW, Power Supply <mailto:[EMAIL PROTECTED]> Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> 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
