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Low End Mac Reviews

Dan Knight - 2008.02.01 - Tip Jar

Rating:

The 'Mystic' PowerMac G4 was the first dual-processor G4 and shipped in 450 MHz and500 MHz versions. Each CPU has a 1 MB backside cache running at1/2 of CPU speed, and that sits on a 100 MHz system bus. We'recomparing that to the NewerTech MAXPower upgrade with a singleFreescale 7448 1.8 GHz G4 CPU. These CPUs have an onboard 1 MBlevel 2 cache that runs at full CPU speed - that's four times as fastas the cache in the stock configuration.

The upgrade is theoretically capable of 4x the performance of thestock 450 MHz CPU under the classic Mac OS, which can only use one CPU,and twice as powerful under Mac OS X, which utilizes bothprocessors. We ran an extensive suite of benchmark tests under Mac OS9.1, 10.2, 10.3, and 10.4 to measure performance.

My primary computer is a 'Mirror Drive Door' Power Mac G4with dual 1 GHz CPUs, 2 GB of RAM, a 400 GB 7200 rpm Deskstar harddrive, and its stock ATI Radeon 9000 Pro video card. Subjectively, the1.8 GHz upgrade in the Mystic feels every bit as fast for everydaytasks, and our Xbench test results (below) verify that.

The MAXPower G4 upgrades are compatible with Sawtooth, Mystic, Digital Audio, Quicksilver, and Quicksilver 2002 G4 PowerMacs. They require a firmware upgrade to be installed before youupgrade your CPU, and this software is conveniently provided on a CD.(You'll also need to use this CD to uninstall the firmware patch to goback to the stock CPU.) The CPU upgrade works with Mac OS 9.2.2 and OSX 10.3.5 and later. I can also report that it works with OS X10.2.8, which I have installed on one partition of my hard drive. It isavailable in speeds of 1.7, 1.8, and 2.0 GHz with a single CPU and 1.7and 1.8 GHz with dual processors. There are also less expensive andslower models that use the 7447A CPU.

Our testbed computer has an 80 GB 7200 rpm Deskstar hard drive, 768MB of RAM, and it's stock ATI Rage 128 Pro AGP 2x video card. The drivehas separate partitions for Mac OS X 10.2 'Panther', 10.3 'Jaguar', and10.4 'Tiger'. Each has been updated to the latest version of that OS,and the only additional software we installed prior to benchmarking areSystem 9.2.2 for Classic Mode and the benchmark programs we ran.

The computer is booted, and then the benchmark apps are run inorder.

Installation

Installation of the processor upgrade isn't difficult, and NewerTecheven provides a Phillips screwdriver in the box. With my Mystic, I hadto unclip the heat sink and remove 3 screws to take out the originalCPU card. The NewerTech upgrade is fully integrated; the heat sinkisn't separate from the CPU card. The upgrade clips into place, butputting the retaining 3 screws in is difficult if you don't have amagnetized Phillips screwdriver. Without one, it took some doing to gettwo of the screws in place, since they go in holes in the heatsink.

Once the upgrade is installed, there are two more steps: You need toattach the second cooling fan, which covers one of the screw holes, andthen connect the CPU upgrade to your Power Mac's power supply, as theCPU and fans draw more power than the CPU socket provides.

Then came my only disappointment: I hadn't installed the requiredfirmware update before installing the CPU upgrade. Back to theold CPU, insert the firmware CD, hold down the programmer switch, pressthe power button, release the programmer switch after the tone, andthen hold down the C key to boot from the CD. It boots right into thesoftware that lets you change the firmware. Very well done,NewerTech!

Then repeat the installation process. If I'd read the instructionmanual first....

Anyhow, the system boots quickly into Mac OS 9.1, 10.2, 10.3, and10.4. I don't have a 9.2.2 installation that works with Mystic,although I do have 9.2.2 setups that work just fine in Classic Mode. Itlooks like I'll have to invest in a full-fledge Mac OS 9.2.2 install CDso I can boot the Mystic and MDD into OS 9.2.2.

User Experience

The dual 450 MHz Mystic isn't a fast computer under OS X, butit's usable. Drop in the 1.8 GHz upgrade, though, and that changes.Safari and Camino load quickly, YouTube videos run smoothly, windowsfly open, and it easily feels twice as fast. That puts in on par withmy primary computer, a dual 1 GHz G4, which is very impressive for anold computer and a single processor, albeit a very fast processor.

If you have an older AGP Power Mac that you're pretty happy with butlacks horsepower, a 'brain transplant' is definitely worth considering.If this were my primary computer, I wouldn't hesitate to drop in afaster CPU card.

The big question is the value of the upgrade: Is it worth $200 or$700 - or somewhere in between - to upgrade your older G4 Power Mac?The MAXPower G4/7448 1.8 GHz Processor Upgrade sells for $325, morethan this computer cost me (used). It comes down a question of how muchit's going to improve your productivity.

NewerTech has a wide-ranging line of G4 upgrades using single anddual 7447A (512 MB onboard cache) and 7448 (1 MB cache) CPUs(prices are from Other World Computing, which owns NewerTech):

• 1.6 GHz 7447A, $230
• 1.7 GHz 7448, $320
• 1.8 GHz 7448, $325
• 2.0 GHz 7448, $400
• 1.6 GHz dual 7447A, $400 (Xbench 1.1.3 = 175.0)
• 1.7 GHz dual 7447A, $425 (Xbench 1.1.3 = 203.8)
• 1.7 GHz dual 7448, $550
• 1.8 GHz dual 7447A, $550 (Xbench 1.1.3 = 216.6)
• 1.8 GHz dual 7448, $699

As fast as this single 1.8 GHz CPU is, I have to wonder how muchmore power a dual 1.6 GHz upgrade would provide. Too bad NewerTechdoesn't make a dual 7448 upgrade for my Mirror Drive Door.

Classic Mac OS Benchmarks

Speedometer 3.0.6

This is one old benchmark program, and it's reference score is the8 MHz Mac Classic from1990. The disk cache is 8 MB, and virtual memory is enabled. Thedisplay was set to 1024 x 768 with thousands of colors. Here arebenchmark results with the stock 450 MHz dual processors (the ClassicMac OS only uses one) and the 1.8 GHz upgrade under Mac OS 9.1:

Overall the 1.8 GHz G4 is 3.3x as fast, and the CPU test comes in atprecisely 4x as fast with Speedometer 3 and Mac OS 9.1.

Speedometer 4

For Speedometer 4, the reference machine is the Quadra 605 from 1993. The disk cache is8 MB and virtual memory is enabled. The display was set to 1024 x768 with thousands of colors. Here are benchmark scores for the stockCPUs and the 1.8 GHz upgrade with Mac OS 9.1 (Speedometer will not runthe graphics benchmark):

Under Speedometer 4, the 1.8 GHz G4 is over 3.3x as fast as the 450MHz CPU, a huge leap in performance, but not quite the 4x we'dexpect.

MacBench 5.0

For MacBench 5 to run graphics tests, we had to set the display to1280 x 1024. The disk cache is 8 MB and virtual memory is enabled.The reference machine is a 300 MHz G3, which scores 100. Tests were runusing Mac OS 9.1:

The CPU score is 3.9x as high with the upgrade, nearly the 4x wewould intuitively expect from a 4x as fast clock speed.

Classic Mode in OS X

Apple does something incredible with Classic Mode: In many ways, MacOS 9.2.2 runs better inside Mac OS X than it does natively. Why?Because OS X handles all of the disk access, networking, andgraphics, leaving OS 9 to handle the rest. Best of all, in a dualprocessor system, Classic is free to take over one CPU while leavingthe other one to handle I/O in OS X.

Speedometer 3.0.6

Running Classic Mode in Panther, here are the Speedometer 3scores:

It's interesting that the CPU scores for Mac OS 9.1 running nativelyis the same as Mac OS 9.2.2 in Classic Mode, and the Math scores arevery close. Because the hard drive and graphics are handled byOS X, their performance is actually higher in Classic mode thanwhen booting into OS 9 itself. The disk score is much, much higher dueto OS X caching data from the hard drive.

Speedometer 4

With Classic Mode in Panther, here are Speedometer 4 results:

As above, the CPU and Math scores are almost identical whetherbooting into Mac OS 9 or using Classic Mode with a single processor,but CPU and Math scores are a bit higher with dual processors. The Diskbenchmark is a bit higher in Classic mode, as all I/O is mediated byOS X.

Mac OS X Benchmarks

Let 1000 Windows Bloom

Under Jaguar (Mac OS X 10.2.8), the Power Mac G4/450 dual ran Let1000 Windows Bloom in 56.4 seconds. Using Panther (10.3.9), it ran thebenchmark in 41.1 sec. with the stock processors and just 25.4 sec.with the 1.8 GHz upgrade, a 62% improvement. Under Tiger (10.4.11), thebase system took 32.2 sec. while the upgraded machine needed only 11.9sec. to complete the test, an improvement of 170%!

Power Fractal

Power Fractal doesn't run under Jaguar. Under Panther, this testtakes 7.0 sec. on the base computer and just 1.8 sec. with the CPUupgrade. Under Tiger, it reports 7.9 sec. with dual 450 MHz CPUs and2.1 sec. with the 1.8 GHz upgrade. I suspect Power Fractal is onlyusing one CPU.

Xbench 1.3

Xbench 1.3 doesn't run under Jaguar, so we ran it under Panther andTiger. Xbench is calibrated to a 2.0 GHz dual Power Mac G5, which wouldscore 100.

The overall score for the MAXPower 1.8 GHz upgrade is roughly doublethat of the dual 450 MHz processors that came in the computer (and halfthe power of a dual 2.0 GHz G5), but that's far from the whole story.The CPU score is 2.5-3 times as high, the Threads rating roughlydouble, Quartz and OpenGL are over twice as fast, and User Interface isnearly 4x as fast. Drive scores are barely changed at all.

It's interesting that the CPU, Quartz, and Drive scores are higherunder Panther than Tiger, yet Tiger wins in OpenGL and User Interface.Threads and Memory are higher with dual processors under Tiger vs.Panther but lower with the single CPU.

By way of comparison, my dual 1 GHz 'Mirror Drive Door' Power Mac G4benchmarks 42.4 overall under Panther and 50.4 under Tiger. The CPUtest score is much higher for the 1.8 GHz upgrade, but Memory is muchfaster on the Mirror Drive Door model with its 167 MHz system bus (vs.100 MHz in the Mystic).

Geekbench

Geekbench only runs on Tiger. Here are our results under Mac OS X10.4.11:

Overall, you can expect twice the performance with the 1.8 GHzupgrade that the stock dual 450 MHz configuration provides.

Conclusion

The Power Mac G4 line was the last family of PowerPC Macs that canreadily take a CPU upgrade, and while the 350 MHz and faster G4processors that shipped with them offered a lot of power in their day(the era of the Classic Mac OS), Apple never offered G4 Power Macs with1.6 GHz to 2.0 GHz CPUs like you can buy today.

If you have a Power Mac G4 (Sawtooth through Quicksilver 2002) thatyou're happy with but need more horsepower, the MAXPower upgrades -ranging from $230 for a single 1.6 GHz CPU to $699 for a pair of 1.8GHz G4s - are worth consideration.

Only you can put a dollar value on increased performance andproductivity. One huge plus to upgrading your current setup is that youdon't have to worry about memory, drives, add-in cards, etc. not beingcompatible, because you're not migrating to a newer Mac.

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