Jack Putnam (of TechnoWarehouse, LLC; Newer Technology... <http://www.technowarehousellc.com/>)Reply on Re: Upgrading questions de jour (from: PCI PowerMacs Digest #1755)
Subject: Re: Upgrading questions de jour (from: PCI PowerMacs Digest #1755) Date: Tue, 19 Nov 2002 13:00:45 -0600 From: Jack Putnam <[EMAIL PROTECTED]> To: "Martin A. Totusek" <[EMAIL PROTECTED]> Hello Martin, > How do you set the bus from 44 MHz to 50 MHz, if you have a Power > Macintosh 7600, and a 400 MHz Newer Technology MAXpowr G4 CPU upgrade > installed? Short answer: You can't. By default, the CPU does determine the bus speed of the 7300-9600 class Macs. On some of the Newer cards (G3s), there is an unsupported and undocumented push setting. By twiddling switches 2 and 3 on the DIP switch, you can push bus speed, and by default, the processor speed as well. The caveat is that it will in many cases introduce instability into the operation of the Mac. Hmmm, faster or reliable, faster or reliable? I know what my choice would be. Specific to your question: you cannot, since the G4s do not have a DIP switch on them. It was removed as a cost saving measure. > I also note that the MAXpowr Control software version 2.0.5 by Ben > Mickaelian (now employed at Sonnet, I understand...) crashes the 7600, > if I try to use the Control Panel to set the Backside cache to anything > besides 200.0 MHz (400.0 � 2.0), so I can not try the 266.7 MHz (400.0 � > 1.5) or the 400.0 MHz (400.0 � 1.0) settings. When you select a ratio greater than the default the card was designed for, the MAXpowr software goes out and does a quick diagnostic test of the cache to determine if it can support the select setting. If it is possible, it will come back with a nice error message that says you have selected too fast a setting for your card, the next slower one has been chosen for you. In some cases, when the cache fails this diagnostic the software is not able to reset the ratio to the lower setting before the crash or freeze occurs. Jack Putnam TechnoWarehouse, LLC "Martin A. Totusek" wrote: <snip> 7300, 7500 and 7600 all have the same 50 MHz maximum bus speed. The processor card determines the operating speed. <snip> Inquiry: How do you set the bus from 44 MHz to 50 MHz, if you have a Power Macintosh 7600, and a 400 MHz Newer Technology MAXpowr G4 CPU upgrade installed? I also note that the MAXpowr Control software version 2.0.5 by Ben Mickaelian (now employed at Sonnet, I understand...) crashes the 7600, if I try to use the Control Panel to set the Backside cache to anything besides 200.0 MHz (400.0 � 2.0), so I can not try the 266.7 MHz (400.0 � 1.5) or the 400.0 MHz (400.0 � 1.0) settings. -Martin Totusek -------- Original Message -------- Message-Id: <a05100303b9f9d7951646@[192.168.2.101]> In-Reply-To: <[EMAIL PROTECTED]> Date: Thu, 14 Nov 2002 14:48:18 -0800 From: Clark Martin <[EMAIL PROTECTED]> Subject: Re: Upgrading questions de jour At 10:08 AM -0700 11/14/2002, Bruce Johnson wrote: >The 7500 and 7600 differ only in the processor card originally >installed and the AV stuff with the 7600, otherwise they're >identical cards. The 7300 has a higher bus speed, and will be >somewhat faster for a given upgrade. 7500 and 7600 have the same AV stuff (Audio In and Out, Video In). 7300, 7500 and 7600 all have the same 50MHz maximum bus speed. The processor card determines the operating speed. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting [EMAIL PROTECTED] -- 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/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
