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You are here: MacNN Forums > Enthusiast Zone > Classic Macs and Mac OS > 800MHz Upgrade for PCI Macs?

800MHz Upgrade for PCI Macs?
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Jul 17, 2002, 08:10 AM
Dig this from xlr8yourmac.com:
</font><blockquote><font size="1" face="Geneva, Verdana, Arial, sans-serif">quote:</font><hr /><font size="1" face="Geneva, Verdana, Arial, sans-serif">
Sonnet Announces G4/800 CPU Card Upgrade for Older PCI Macs - Including PowerCenter/Pros - The G4/800 CPU card upgrade for 7300-9600 Macs (and comparable clones) shown in recent magazine ads has been officially announced by Sonnet. Note that this is the first G4 upgrade claimed to work with the Catalyst based Macs such as the PowerCenter/Pro. Here's a clip from the press release:

" New York July 17, 2002. Sonnet Technologies...accomplishes tremendous technological breakthroughs with the announcement of the Crescendo/PCI G4 800 MHz processor upgrade for PCI Power MacŪ machines. This highly-anticipated product is made possible by Sonnet's superior design, which utilizes a new 7455 AltiVec-enabled G4 chip, and 1MB of L3 backside cache.
While previous generations of the G4 were limited to operation at nine times the speed of the bus in the host system, these new chips allow for a much higher multiple, raising the theoretical maximum on a 50 MHz PCI platform bus from 450 MHz to 800 MHz and beyond. Through arduous testing and development, Sonnet engineers have fully addressed several challenges unique to this new generation of processors, including entirely new voltage requirements, signal compatibility and heat dissipation issues. As a result, the Crescendo/PCI G4 800 not only performs reliably at very high processor speeds, but also fully supports applications that leverage the AltiVec/Velocity Engine in both OS 9 and OS X (if the customer chooses to utilize Sonnet's PCI X Installer).

Additional design innovations have resolved G4 compatibility issues with heavily loaded six-slot machines, providing a reliable and powerful solution for the music and video professionals who rely on these systems. ..
The Crescendo/PCI G4 800 is also the first G4 processor upgrade to be compatible with certain Power Computing Macintosh clone models. Until now, some of these systems could only support G3 processor upgrades. [Note: actually the G4 issue with clones was related to the Catalyst based Macs like the PowerCenter/Pro - G4 upgrades have been available for Clones based on other motherboard designs with a CPU card slot like the Umax S900, PowerTower Pro, etc..-Mike]
The complete list of compatible Macintosh models is:

- Power Mac 7300, 7500, 7600, 85xx, 8600, 95xx, 9600
- Workgroup Server 7350, 8550, 9650
- Daystar Genesis
- PowerCenter, PowerCenter Pro, PowerCurve, PowerTower, PowerTower Pro, PowerWave
- UMAX J700/S900

OS X Compatibility
In June 2001, Sonnet offered owners of Crescendo/PCI G3 and G4 cards the option of downloading a Sonnet installer to run MacŪ OS X on the PCI models mentioned above (Sonnet's OS X Installer is not compatible with PowerCenter, PowerCenter Pro, PowerCurve, PowerTower). Mac OS X's compatibility in these machines will match that in Power Macintosh G3 computers. This breakthrough solution is accessible from the Sonnet web site for a download fee of $29.95. For Sonnet's complete Mac OS X Statement as well as information on Sonnet PCI X Installer Updater please refer to the Sonnet web page at <a href="http://www.sonnettech.com/news/macosx_update.html." target="_blank">http://www.sonnettech.com/news/macosx_update.html.</a>

Pricing and Availability
The Crescendo/PCI G4 800 will be available in August and will have an estimated street price of $399.95. "</font><hr /></blockquote><font size="1" face="Geneva, Verdana, Arial, sans-serif">Hmmm.. Makes me wonder if putting $400 into my old 7300 is worth it as a backup...

<small>[ 07-17-2002, 08:35 AM: Message edited by: Dan Szwarc ]</small>
"I guarantee that I am correct."
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Join Date: May 2002
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Jul 18, 2002, 02:18 PM
already saving my pennies to stick one of those bad boys in my 8600
*looks through pockets* sigh
only 39,998 more to go. gotta get a new mayo jar.

<small>[ 07-18-2002, 02:20 PM: Message edited by: dwishbone ]</small>
24" iMac 2.13ghz C2D | 15" MBP 2ghz CD | "Soundwave" 60GB 5G iPod
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Aug 4, 2002, 06:10 PM
Anyone know how Sonnet managed this? I understand they are using the 7450 and not the old 7400 that was limited to a bus multiplier of 9x. Anyone know what the bus multiplier of the 7450 is?

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Aug 6, 2002, 04:25 AM
I still wonder how the performance would compare with a newer PowerMac or iMac seeing the bus speeds of the older macs are 35-50Mhz. Bus speeds are really important for system performance and I just wonder how much benifit the 800Mhz upgrade gives over a 500Mhz upgrade; I would think the benifits are limited by the bus speed.

Can't wait to see some benchmarks, might upgrade my old 8500/120.
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Aug 6, 2002, 01:46 PM
Originally posted by X_RuLeZ:

Can't wait to see some benchmarks, might upgrade my old 8500/120.
yeah i'm waiting to see if it's work to shoot some life into my S900/200mhz. I wanna put off dropping 4k on a maxed out new one for just a while longer...

Eric Henao
Eric Henao - Graphic Designer
Dual 2.5 GHz G5 - 2.5 GB RAM - OS 10.3.7
and TECHNO music!!!

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Aug 14, 2002, 12:54 PM
Does anybody know if 10.2 will be supported with this upgrade? I'm curious about that and whether not the doubled clockspeed (compared to my PowerLogix 450mhz upgrade) will overcome the system bus speed roadblock to working with Digital Video (iMovie2, etc).
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Oct 19, 2002, 10:16 AM
I have an 8500 souped up with a Newer G3 500. I would toss the Sonnet 800 puppy in it if I could find someone/somewhere to see some benchmarks??? I get conflicting info on how or if they overcome the bus bottleneck. But the 8500 has a 50 mhz bus and Sonnet says they go 50 x 16 = 800! But, sounds to good to be true......where do we get hosed???
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