XLR8 MACh Speed G3 ZIF User manual

Default Actual Jumper Settings Bus ratio
Setting Speed
300 / 300 4.5 to 1
333 / 333 5.0 to 1
350 / 333 5.0 to 1
366 / 366 5.5 to 1
400 / 400 6.0 to 1
450 / 466 7.0 to 1
466 / 466 7.0 to 1
500 / 500 7.5 to 1
533 / 533 8.0 to 1
550 / 533 N/A N/A
600 / 599 9.0 to 1*
Installation and User Manual
MACh
Speed
ZIF™
Installation and User Manual
Base Settings Switches in the “ON” position Jumper Settings Bus Speed Bus ratio
300 1,3,4,6 - 10,11,12 40.0 7.5 to 1
333 3,4,6,7,8 - 9,11,12 48.0 7.0 to 1
366 1,6,7,8 - 11,12 49.0 8.0 to 1
400 1,2,4,6,7,8 - 9,10 50.0 8.0 to 1
450 2,6,7 - 9,12 45.0 10.0 to 1*
466 1,2,6,7 - 9,12 46.6 10.0 to 1*
500 1,2,4,6,7,8 - 9,12 50.0 10.0 to 1*
550 1,4,6,7 - 9,10,12 46.0 12.0 to 1*
600 1,2,4,6,7,8 - 9,10,12 50.0 12.0 to 1*
XLR8 MVP™Speed Settings
Master Chart
over
1. Install the latest version of XLR8 MACh Speed Control. 2. Locate CPU base
settings. 3. Remove and adjust card switches jumpers and/or dials (all available) to the relat-
ed settings in the chart below. 4. Remove motherboard cache from motherboard if possible.
5. Press CUDA reset on motherboard (with CarrierZIF only) 6. Reinstall card – boot system.
XLR8 Standard ZIF Settings
Set jumpers with card
oriented with CPU to left
and XLR8 right side up
ZIF Daughtercards
MACh
Speed G
4
Z™
MACh
Speed G
3
Z™
G3 and G4 ZIF Daughtercard upgrades for the
PowerMac G3 and the 400 MHz PowerMac G4
** Verify CPU multiplier with product – 9.0x, 10.0x and 12.0x based speeds not available on all CPU’s.
50 MHZ SYSTEMS –WITH CARRIERZIF ADAPTER
* Verify CPU multiplier with product – 9.0x, 10.0x and 12.0x
based speeds not available on all CPU’s.
66 MHZ SYSTEMS
POWERMAC G3 (BEIGE)
Default Actual Jumper Settings Bus ratio
Setting Speed
300 / 300 3.0 to 1
333 / 300 3.0 to 1
350 / 350 3.5 to 1
366 / 350 3.5 to 1
400 / 400 4.0 to 1
450 / 450 4.5 to 1
466 / 450 4.5 to 1
500 / 500 5.0 to 1
533 / 500 5.0 to 1
550 / 550 5.5 to 1
600 / 600 6.0 to 1
100 MHZ SYSTEMS
POWERMAC G3 (TRANSLUCENT)
POWERMAC G4 (400 MHZ ONLY)

Default Actual Jumper Settings Bus ratio
Setting Speed
300 / 300 4.5 to 1
333 / 333 5.0 to 1
350 / 333 5.0 to 1
366 / 366 5.5 to 1
400 / 400 6.0 to 1
450 / 466 7.0 to 1
466 / 466 7.0 to 1
500 / 500 7.5 to 1
533 / 533 8.0 to 1
550 / 533 N/A N/A
600 / 599 9.0 to 1*
ml_mszif_102199-C
ml_cvr_mszif_102199-C
Installation and User Manual
WICHITA: 8447 E35th N., Wichita, KS 67226, 316-636-5544, fax [phone]
ATLANTA: One Meca Way, Norcross, GA 30093, 770-564-5682, fax [phone]
CHICAGO: 1000 Tower Lane, 385, Bensenville, IL 60106, 630-238-9095, fax [phone]
EUROPE: Abbot House, Primrose Hill, Kings Langley, Hertfordshire, WD4 8HY, UK,
44-0-1923-290401, fax 44-0-1923-290402
MACh
Speed
ZIF™
Installation and User Manual
Base Settings Switches in the “ON” position Jumper Settings Bus Speed Bus ratio
300 1,3,4,6&10,11,1240.0 7.5to1
333 3,4,6,7,8&9,11,1248.0 7.0to1
366 1,6,7,8&11,1249.0 8.0to1
400 1,2,4,6,7,8&9,1050.0 8.0to1
450 1,2,4,6,7,8 &9,10,11,121250.0 9.0to1(G4 Only)
466 1,2,6,7&9,1246.6 10.0to1(G3 Only)
500 1,2,4,6,7,8&9,1250.0 10.0to1(G3 Only)
550 1,4,6,7&9,10,1246.0 12.0to1*
600 1,2,4,6,7,8&9,10,1250.0 12.0to1*
1. Install the latest version of XLR8 MACh Speed Control. 2. Locate CPU base
settings. 3. Remove and adjust card switches jumpers and/or dials (all available) to the relat-
ed settings of THE DESIRED SPEED.4. Remove motherboard cache from motherboard if possible.
5. Press CUDA reset on motherboard (with CarrierZIF only) 6. Reinstall card – boot system.
XLR8 Standard ZIF Settings
Set jumpers with card
oriented with CPU to left
and XLR8 right side up
ZIF Daughtercards
MACh
Speed G
4
Z™
MACh
Speed G
3
Z™
G3 and G4 ZIF Daughtercard upgrades for the
PowerMac G3 and the 400 MHz PowerMac G4
** Verify CPU multiplier with product – 9.0x, 10.0x and 12.0x based speeds not available on all CPU’s.
50 MHZ SYSTEMS –WITH CARRIERZIF ADAPTER
* Verify CPU multiplier with product – 9.0x, 10.0x and 12.0x
based speeds not available on all CPU’s.
66 MHZ SYSTEMS
POWERMAC G3 (BEIGESystems)
Default Actual Jumper Settings Bus ratio
Setting Speed
300 / 300 3.0 to 1
333 / 300 3.0 to 1
350 / 350 3.5 to 1
366 / 350 3.5 to 1
400 / 400 4.0 to 1
450 / 450 4.5 to 1
466 / 450 4.5 to 1
500 / 500 5.0 to 1
533 / 500 5.0 to 1
550 / 550 5.5 to 1
600 / 600 6.0 to 1
100 MHZ SYSTEMS
POWERMAC G3 (Blue & White)
POWERMAC G4 (PCI PowerMac)

Installing
and Using the
Software
This chapter provides installation instructions for XLR8’s exclusive
and fully-automated XLR8 MACh Speed Control and will provide
detailed instructions on:
• Installing XLR8 MACh Speed Control
• Using XLR8 MACh Speed Control
Your package includes the XLR8 Universal Install CD which includes everything needed to
enable and periodically review your upgrade card’s status, additional information, and electronic
documentation. The latest updates are available via http://www.xlr8.com.
Installing XLR8 MACh Speed Control
Installation of XLR8 MACh Speed Control is fully automatic. Installing this software prior to
installing the processor upgrade is highly recommended.
1. Install the software:
• After booting your Macintosh, insert the XLR8 Universal Install CD.
•Navigate to the MAChSpeed Control - OS9 Installer.
Note that the following instructions relate to an OS9 install. If you have OS X,
the operaiton and use is basically the same, excpet that the app is installed in Applications/Utilities
• Launch the XLR8 MACh Speed Control installer by double-clicking the XLR8 MACh Speed
Control installer icon.
• Read the text and follow the on-screen instructions until you have completed the installation.
•Restart your computer. You will be promted to enter the serial number located on the CD.
Chapter 1 - Installing and Using the Software
Page 2
1
Preface
Thank you for choosing the MACh Speed™ZIF upgrade. This manual is designed for two
XLR8 processor upgrades:
•MACh Speed G3 ZIF: G3 Processor upgrade
•MACh Speed G4 ZIF MPe: Multiprocessing Enabled G4 Processor upgrade
This manual contains the following sections:
Installing the software - Detailed information on the installation and use of XLR8’s exclusive
XLR8 MACh Speed Control software.
Installing the MACh Speed Card - Detailed information on the installation of the ZIF daughtercard
in various systems
Technical Support - This section includes support information and troubleshooting techniques.
About performance tuning
Your MACh Speed processor card was preset from the factory to the default setting. You may choose to
change the CPU ratio setting at a later time to optimize the performance of your upgrade.
It is highly recommended that the initial installation of the card be performed with default settings.
Refer to the Advance Performance Tuning section of this manual to fine tune your system
performance when your system has been running for a suitable period of time.
Included with your package
Your package includes:
• The MACh Speed ZIF processor upgrade card
•In-box notice
•XLR8 MACh Speed Control software & documentation on CD
• XLR8 Firmware updater (for PowerMac G3 B&W systems and G4 upgrades)
•Arctic-Silver Thermal Grease and application tools
Important Information
Before installing your MACh Speed upgrade card, carefully read the instructions covering your
machine.
Chapter 1 - Installing and Using the Software
Page 1

2. Processor panel: This panel gives information on the processor revision number and special
features it may have.
3. Cache panel: This panel allows to modify the options for the G3/G4 processor(s) backside
cache and motherboard cache.
Backside Cache Speed: Selecting the “Manual” setting allows you to select any available speed.
Speeds selected manually will remain in effect until changed. Selecting the
“Automatic” setting will cause the cache to run at the default working
speed. Please note that sometimes this is not the fastest speed that may be
available.
Power Conservation: Enabling Power conservation is recommended for all processors.
Chapter 1 - Installing and Using the Software
Page 4
Using XLR8 MACh Speed Control
Checking the status of your card
In the Control Panels folder of your start-up disk, open XLR8 MACh Speed Control by selecting it in
the Control Panels hierarchical menu in the Apple Menu. In addition to controlling the backside
cache of the upgrade card, XLR8 MACh Speed Control also provides dynamic information on the
status of your card and the configuration of your computer
Navigating the Control Panel is accomplished via the tabs at the top of the dialog. Information for
each of the tabs is shown below. Interactive help is always available by clicking on the Help icons.
1. Settings panel: Displays the current settings for the processor upgrade.
Processor: Identifies the number of processors installed, its/their type, ist/their speed
(in Mhz) and its/their temperature. Also indicates the amount of level 1
cache on the processor(s).
Backside Cache: Provides information on the backside cache size and access speed (in MHz)
Memory: Amount of physical installed RAM and bus speed of the motherboard.
Chapter 1 - Installing and Using the Software
Page 3
Panel Tabs
Processor Type and
maximum multiplier
Size of the level 1
cache
Size and Speed of the
Level 2 cache
Amount of installed
RAM and bus speed
Processor Version
Cache Panel
Processor Panel
Backside cache speed
Automatic/Manual
Setting

Preparing the
MACh Speed ZIF
Card for
Installation
Before installing the MACh Speed ZIF card into your system, it is necessary to prepare the card for
the installation.
Adjusting the Jumpers on the MACh Speed card
Before installing the MACh Speed card, you need to adjust the jumpers in order to set the
speed of your upgrade card.
The jumpers are adjusted on the card itself, you do not need to changer the jumpers on
the motherboard of your PowerMac.
The jumpers are set from the left to the right, when the XLR8 logo is at the top left
corner and the jumper block at the right side of the card.
Chapter 2 - Preparing the MACh Speed for the installation
Page 6
4. Memory Panel: The memory panel gives extensive information on the RAM configuration of
your computer. This panel shows the location of each RAM module - A RAM
bank has an unique identifier.
4. Support Panel: The support panel contains contact information for technical and/or general
inquiries about XLR8 products.
Chapter 1 - Installing and Using the Software
Page 5
2
Cache Panel
Support Panel
RAM module size
Slot number

Installing the
MACh Speed ZIF
Upgrade Card
This chapter provides information for installing the MACh Speed ZIF card into individual systems.
General Installation Instructions
Before installing your MACh Speed ZIF upgrade card, you should review this short section.
1. Attach the anti-static wrist strap to the end of a plugged-in power cable, such as the one used for
your computer. The wrist strap will ensure that you are well grounded and avoid any unexpected
static discharges.
2. Prepare the system and work area.
• Prepare your work area by ensuring that you have a well-lighted space, preferably not on
carpet (static), and away from all magnetic devices.
• Turn off the computer and disconnect all cables.
Installing the CPU card is technically challenging. If you prefer, you can ask an Apple-authorized
dealer or service provider to install it for a fee.
If you attempt to install the card yourself but experience difficulties, it is recommended that you
have an Apple-authorized service provider complete the process. Apple does not warranty damage
caused by improper removal or installation of CPU cards.
Chapter 3 - Installing the MACh Speed card
Page 8
3
The default settings are the following:
Applying the thermal grease
The MACh Speed ZIF upgrade card ships with a box containing thermal grease. The thermal grease
needs to be applied onto the processor in order to improve the heat transfer to the heatsink.
1. Attach the anti-static wrist strap to the end of a plugged-in power cable, such as the one used for
your computer. The wrist strap will ensure that you are well grounded and avoid any unexpected
static discharges.
2. Apply a small amount of heatsink thermal grease to the center of the CPU.
3. Your CPU is now ready to be installed.
Chapter 2 - Preparing the MACh Speed for the installation
Page 7
Default Jumper Settings
Setting
300
333
366
400
433
466
500
533
POWERMAC G3 (BEIGE)
Default Jumper Settings
Setting
300
350
400
450
500
550
POWERMAC G3 (BLUE&WHITE)
POWERMAC G4/PCI

1. Lift the latch on the side of the computer and gently
lower the panel onto a clean, flat surface
2. Locate the heat-sink and CPU on the motherboard.
• The CPU card is located to the right of the
memory sockets. It rests in a dedicated ZIF (Zero
Insertion Force) socket.
3. Remove the heat-sink.
• Insert the small screwdriver that ships with your card into the slot on the heat-
sink clip. NOTE: A razor is included to clean the bottom of the heatsink.
• Press down and rock the handle of the screwdriver towards the heat-sink fins,
releasing the heat-sink’s clip from the lock tab.
4. Remove the CPU Card.
• Carefully raise the ZIF Socket Release Lever and lift the CPU card from
the socket.
Chapter 3 - Installing the MACh Speed card
Page 10
Installation in a Power Macintosh G3 Blue & White
and PowerMac G4 (PCI Graphics)
IMPORTANT: If you are installing a G4 processor into your PowerMac G3
Blue&White, you will have to update the firmware of your computer first.
Updating/patching the firmware is not necessary on PowerMacs G3 Beige
and G4.
Updating the firmware version 1.0 to version 1.1:
The XLR8 Firmware updater works only with version 1.1 of the original Apple firmware. If
you have not updated your firmware to version 1.1, it will be necessary to update your firmware.
YOU MUST BOOT INTO MAC OS 9!
1. Insert the XLR8 Universal CD into your CD-ROM drive
2. Open the folder “For B&W G3s...”
3. Double-click the file “1-G3 Firwware Update...”if you DO NOT have the latest 1.1f4.
4. This will open a disk image on your desktop.
5. Open thedisk image and double-click on the installer file.
6. Launch the installer
7. Follow the on screen instructions.
8. Click the shutdown button
9. While holding down the Programmer’s button on the front of the computer, power
up your computer (this is the indented button).
10. You will hear a long tone. Once the tone stops, you can release
the programmer’sbutton. The firmware has been updated.
Applying the XLR8 Firmware patch:
The Apple Firmware v.1.1 of the PowerMac G3 B&W has been
designed not to run with G4 processors. Applying the XLR8
firmware patch allows you to install your G4 upgrade.
1. Insert the XLR8 Universal CD into your CD-ROM drive
2. Open the folder “For B&W G3s...”
3. Launch the "2-XLR8 Firmware updater...". You will be prompted to shutdown your
computer
4. Startup the computer while holding down the programmer’s switch depressed until
the long tone stops, then release the switch.
Note: The XLR8 Firmware updater works only with version 1.1 of the original Apple
firmware. If you get an error message while applying the XLR8 Firmware updater, you are
probably running version 1.0 of the firmware. You will have to first update your Apple
firmware to version 1.1.
Chapter 3 - Installing the MACh Speed card
Page 9
Heat-sink
Heat-sink
clip Slot for
Screwdriver
Lock tab
Raise Card
ZIF socket
release lever
CPU and
Heatsink

Installation in a Power Macintosh G3 Beige
Desktop or Mini-Tower
Getting access to the processor
Desktop: Press the two release buttons under the front panel and slide the cover toward you
approximately two inches, lift it straight up and off the computer.
Mini-Tower: Lay the computer on its side with cover and buttons facing up and remove the cover
from the computer.Press the green
Chapter 3 - Installing the MACh Speed card
Page 12
5. Install the MACh Speed ZIF into your system.
• The MACh Speed ZIF Upgrade will face the same direction as the older card that you
just removed (note the missing pin.)
• Holding the card by the edges (do not depress the center of the card), line up the
pins and insert the card straight down. Insertion should require only minimal force.
• Lower the ZIF Socket release lever to lock the card into the socket.
• Replace the heat-sink on the MACh Speed ZIF card.
• Reattach the heat-sink clip by first “hooking” the end of the clip with the single hole
to the back of the processor socket.
• Press down on the front end of the clip to snap onto the lock tab on the front of the
processor socket.
6. Raise the computer’s side panel and press it against the case. Squeeze the side panel
until it snaps securely into place.
7. Package the old CPU card for later.
• Put the used card into MACh Speed anti-static box. If you ever have a
problem, it may be handy to be able to use the old card while troubleshooting
the system.
8 Reconnect all cables and reboot your system. The installation is finished.
Chapter 3 - Installing the MACh Speed card
Page 11
Hook behind
processor socket
Press down on
clip to snap onto
lock tab
Desktop
Swing the chassis up and insert the
support arm.
• Lift the chassis by the tab until the
support foot rests securely on a flat
surface.
Mini-Tower
• Use the handle to open the chassis.
• Gently swing the top chassis to the
right until it rests firmly on your work
surface.
Desktop
Unlock the chassis and open the support
foot.
• Open the expansion card cover.
• Slide the chassis release switches
inward.
• Flip out the support foot until it locks
into the open position.
Mini-Tower
Open the chassis.
• Unlock the top chassis by moving the
two locking levers upward and
outward.

Removing the old processor
5. Remove the heat-sink.
• Insert the small screw-driver into the slot on the heat-sink clip.
• Press down and rock the handle of the screwdriver towards the heat-sink fins,
releasing the heat-sink’s clip from the lock tab.
6. Remove the CPU Card.
• Carefully raise the ZIF Socket Release Lever and lift the CPU card from the
socket. NOTE: A razor is included to clean the bottom of the heatsink.
• Put the used card into MACh Speed anti- static box. If you ever have a problem, it
may be handy to be able to use the old card while troubleshooting the system.
7. Install the MACh Speed ZIF into your system.
• The MACh Speed ZIF Upgrade will face the same direction as the older card that
you just removed (note the missing pin.)
• Holding the card by the edges (do not depress the center of the card), line up
the pins and insert the card straight down. Insertion should require only
minimal force.
• Lower the ZIF Socket release lever to lock the card into the socket.
• Replace the heat-sink on the MACh Speed ZIF card.
• Reattach the heat-sink clip by first “hooking” the end of the clip with the single
hole to the back of the processor socket.
• Press down on the front end of the clip to snap onto the lock tab on the front of
the processor socket.
Chapter 3 - Installing the MACh Speed card
Page 14
Chapter 3 - Installing the MACh Speed card
Page 13
Heat-sink
clip
Slot for
Screwdriver Lock tab
Hook behind
processor socket
Press down on
clip to snap onto
lock tab
Raise Card
ZIF socket
release lever
Leverage clip outward
Desktop
Locate the processor and heatsink Mini-Tower Locate the processor and heatsink
CPU and
Heatsink
Missing pin on the
ZIF connector
Desktop
Close the chassis by disengaging the
support arm and gently swing the chassis
back into place.
• Lift up the support arm to disengage it
from the hole on the floor of the
bottom chassis.
• Gently swing the top part of the chassis
down until it rests securely on the
bottom chassis.
• Close the expansion card cover and put
back the main cover onto the computer.
Mini-Tower
Replace the chassis by swinging it back into
place and lock it with the two green levers.
• Replace the cover on the computer

Chapter 4 -Technical Support
Page 16
Key Commands for XLR8 MACh Speed Control
The MACh Speed Control Software includes a series of key commands and useful identifiers if the
problem is due to the card itself.
To disable the cache on boot-up:
• Depress the “shift” key on boot-up to disable extensions, or
• Depress “command-option-x-d” until the XLR8 extension is displayed.
To disable the cache during normal operation:
• Select “Disable” in the Manual settings of the Advanced tab in XLR8 MACh Speed Control
To retest the cache on boot-up: (the cache is tested on the first boot after changing the CPU speed)
• Depress “command-option-x-r” on boot-up until the XLR8 extension appears.
To disable the cache test on boot-up:
• Depress “command-option-x-d” on boot-up until the XLR8 extension appears.
Troubleshooting the MACh Speed ZIF card
If your computer does not power up (Three tones? Redo the Firware Patch!)
• Make sure the cables, video and/or other PCI cards are properly seated and connected.
• Check the MACh Speed ZIF card to see if it is properly and fully seated and that
the heat-sink is properly installed and seated on the CPU card.
• If your computer still does not power up, try removing and reinstalling the MACh
Speed ZIF card.
If your computer powers up, but freezes during startup
• ZAP the P-Ram. This is an area of memory on the motherboard that retains card
settings/date/motherboard devices/etc. To refresh/ZAP, depress the
“command-option-P-R” keys simultaneously, immediately after the boot chime (a second
chime should occur.)
• If you are still having problems, try starting up with extensions disabled. This will
also disable the backside cache on the upgrade card.
• If you system did not freeze when booting with extensions off, reboot holding the
Space Bar down. During the boot sequence the Apple Extension Manager dialog
will be displayed. Select Base OS settings, then scroll to re-enable the MACh Speed
Control. Press Continue. If you are able to boot at this point, you have a software
conflict. Reboot and re-enable extensions one at a time, until you find the conflict.
You can then change the first letter of the Extension's name to change its load
order, and usually fix the conflict.
• If you have installed a MACh Speed G4 ZIF MPe in a PowerMac G3 Blue&White,
make sure you have updated your Apple firmware to version 1.1 and applied the
XLR8 firmware patch before installing your upgrade card.
• Perform a “Clean Install” of your system software. You can select the “Clean Install” in the
option of the MacOS installer. Performing a clean install, does not delete your current
system folder, but will keep it on your hard drive with the name “Previous System Folder”
Technical
Support
Technical Support E-mail Address:
[email protected]
Web Address:
www.xlr8.com
About troubleshooting the
MACh Speed ZIF upgrade card
This section provides information on troubleshooting your system with the MACh Speed
ZIF upgrade and software installed. Additional Troubleshooting information is available
on the web at www.xlr8.com/support or www.xlr8.com/osc
Note that most problems associated with the MACh Speed ZIF Upgrade are usually related
to software conflicts or corruption that manifests itself only while running at the faster
speeds. To test a problem system, always attempt to return the system to its simplest config-
uration. Disable all unneeded software, and disconnect all optional devices.
Chapter 4 - Technical Support
Page 15
4

Chapter 4 -Technical Support
Page 18
Chapter 4 - Technical Support
Page 17
Default settings for the MACh Speed G3 ZIF and
MACh Speed G4 ZIF MPe upgrade cards
Adjusting the jumpers on the MACh Speed ZIF card
Before installing the MACh Speed card, you need to adjust the jumpers in order to set the
speed of your upgrade card.
The jumpers are adjusted on the card itself, you do not need to changer the jumpers on
the motherboard of your PowerMac.
The jumpers are set from the left to the right, when the XLR8 logo is at the top left
corner and the jumper block at the right side of the card.
If your system is unstable:
• If you have used MVP to boost the processor upgrade beyond its default settings, i.e. running
at a faster bus speed or a faster processor speed, you may have boosted it beyond its
capabilities. Back the speeds down to the default settings and try again.
• Boot the computer and restart. Then erase (ZAP) the P-RAM.This is an area of memory on
the motherboard that retains card settings/date/motherboard devices/etc. To erase/ZAP,
depress the “command-option-p-r” keys simultaneously, immediately after the boot chime.
Wait for a second chime to occur, then release the keys.
• Try running the backside cache at a slower speed. The automatic setting used by the MACh
Speed software should generally be safe, but it is not foolproof. In particular, if MVP is being
used to squeeze extra performance out of the processor upgrade, the software may select a
speed that is unsustainable. Use “Manual” to select the next lowest speed from the pop-up
menu and restart the machine. If stability returns, then the backside cache was running too
fast. If you are using MVP, move the processor upgrade back towards its default speed in
order to regain cache performance. An extra 50MHz of backside cache performance is far
more beneficial than an extra 10 MHz of processor performance.
• Depress “command-option-x-r” on reboot until the XLR8 extension is displayed. This will
rerun the cache test and assist in setting the correct cache speed.
• Verify all connections and SCSI Termination settings.
• Open the “Extension Manager” control panel and select “MacOS all” in the “Selected set”
pop-up menu. Then activate the XLR8 MACh Speed Extension and the XLR8 MACh Speed
Control. You will be asked to create a new set of extensions. Restart your computer. If you do
not experience any stability problems, you have an extension conflict. You will have to
activate the third-party extensions one by one to find out which one is conflicting.
Default Jumper Settings
Setting
300
333
366
400
433
466
500
533
POWERMAC G3 (BEIGE)
Default Jumper Settings
Setting
300
350
400
450
500
550
POWERMAC G3 (BLUE&WHITE)
POWERMAC G4/PCI