Interex MACh Speed G3 quick start Miscellaneous Performance Notes

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2.Uncheck automatic startup of the cache.

To avoid having problems with boot-up if you select “too fast” of a setting, deselect the “Enable backside cache at startup box”. You can enable automatic start-up later once you have found the optimum setting.

3.Select “Advanced Options:

Set the Cache control to the next highest Ratio. some set- tings are not available for some card as the setting would result in speeds much too high for the cache.

Select “OK”

Setting the Cache Ratio for Maximum speed

4.Restart the backside cache

In the main window, select “Enable Now”

If you freeze at this point, then you have selected too fast of a setting for your backside cache. It is possible to adjust the CPU settings on the card to a slower setting, then using a higher ratio on the backside cache.

Your system should be able to run memory tests such as TechTool Pro or DayStar’s PowerControl Testing software overnight consistently to operate at the higher speeds.

Chapter 4 - Advanced Performance Tuning

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Miscellaneous Performance Notes

Many factors effect the performance of the CPU card. using high quality expansion products, cables and RAM will ensure that you have a system that can perform much faster with a “tuned” MACh Speed upgrade.

Any speed can be set for any CPU, but a CPU will gener- ally only operate at 20% more than its manufacturer rated speed.

Most of the logic boards supported by the MACh Speed have a maximum Bus Speed of around 50 MHz.

The CPU operating speed and the cache operating speed are linked by the BUS speed on the card. The final oper- ating speed of each is determined by the its Ratio to the card’s BUS speed.

CPU operating clock speed is determined by: BUS Ratio X BUS Speed = CPU speed in MHz.

Once the MACh Speed G3 Upgrade Card is installed, the Motherboard Level 2 cache becomes a Level 3 cache. Since the Motherboard cache is smaller than the Level 2 cache, it will not add to the system performance. If possi- ble (as in the 8500/7500), you should remove the mother- board cache.

Chapter 4 - Advanced Performance Tuning

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Contents Table of Contents Advanced Performance Tuning Provides Included with your package About Performance TuningInstalling the Card QuickstartRemove the existing CPU card Installing the Software General Installation Instructions Installing MACh Speed G3 Upgrade CardInstallation in a PowerMac 7300, 7500, or Flip the expansion card cover open Reset button Installing the grounding clip Proceed to Installing Softwar Installation in a PowerMac 8500or Unplug the auxiliary fan form the mains logic board Removing the auxiliary fan retaining clip on Inspecting the MACh Speed G3 Lifting the auxiliary fan retaining clip on Replacing the cover Installation in a PowerMac 8600, or CPU Swinging the chassis into place Rotating the locking levers Installing the MACh Speed G3 Upgrade Card Removing the CPU card from a tower system Installing the MACh Speed G3 Upgrade Card After you ha ve installed your MACh Speed G3 Installing the SoftwareProcessor Info Utility MACh Speed G3 Control Current MACh Speed Settings Advanced Performance TuningAbout Multiple Variable Processing Adjusting for Maximum CPU Operating SpeedAdjusting the Maximum Backside Cache Speed MVP CPU Frequency ChartMiscellaneous Performance Notes Technical Support Troubleshooting the MACh Speed CardLimited Warranty Declaration of Conformity