>I notice it has 8 DIMM slots, and my 9600 and Daystar >Genesis MP 800+ both have 12 DIMM slots. How diffeent >is the logic board in these 8-DIMM clones??? It >appears that the internal bus runs at only 45 MHz. Is >this a problem ??
It is a 9500 derivative design, which was intentionally reduced to 8 DRAM slots (from 12) in order to reduce competition with the 9500/9500. The early 9500/9600 bus was just under 50 mHz. The later 8600/9600 bus (Mach 5) was 50 MHz, exactly. You can try experimenting with higher bus speeds, but 45 MHz was most likely selected as the most stable choice for 225 MHz. 45 MHz * 5.0 = 225 MHz. Apple never offered 225 MHz in their related models, but they did have a 233 MHz. 233 MHz / 5.0 = 46.6 MHz. And, those machine can get into trouble running the bus above somewhere under 50 MHz ... perhaps around 47 MHz. I have a 400 MHz G3 upgrade card in one of my PowerTower Pro 225s, and it (the card) runs the bus at 46.9 MHz. Oh, generic USB cards seem to work well in Power Tower Pros, but not "combo" USB/Firewire cards. And, some USB-only cards don't work, either. Really not much SCSI-Voodoo in a Power Tower Pro. You can get into trouble with lots of drives, especially late model ones, because the drives have active terminators, and only the last drive on the physical cable should be terminated. If you're really paranoid about Voodoo, get a terminator from a Q950 and run all drives unterminated, installing the Q950 terminator in the last connector. The Q950's internal SCSI cable had an extra connector on the very end reserved just for this terminator. -- 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/> iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
