Interex MACh Speed G3 quick start About Multiple Variable Processing

About Multiple Variable Processing™

Only XLR8’s MACh Speed G3 CPU CPU cards have the advan- tage of Multiple Variable Processing. This unique feature allows you to fine tune your card to the hardware and software configura- tion of your computer model.

This fine tuning is accomplished by adjusting the CPU Card BUS Speed with switches 1-7 on the MACh Speed card.

Once the BUS speed is set, Ratios are set which determine the final operating speed of the CPU (switches 8-12 on the card) and its dedicated cache (via the control panel).

Adjusting for Maximum CPU Operating Speed

Adjusting for Maximum Speed is “hit & miss” at best. To find your maximum, you will have to find the “wall”. This can only be located by adjusting to the point that the card fails, then lowering the settings.

This is not for the faint of heart. But it is very rewarding. You will reap the benefits of extreme speed and productivity.

XLR8 Utilizes a series of 12 switches on the MACh Speed G3 Upgrade card to adjust the BUS Speed (CPU to motherboard) and the CPU to BUS Ratio (CPU Multiplier) in order to set the actual CPU speed at which the card will operate.

•Switches 1-8 set the Card’s BUS Speed.

•Switches 9-12 determine the Ratio (or multiplier) at which the CPU will operate.

Base Settings	Switches in the “ON” position		Bus Speed	Bus ratio
220	1,3,4,6 - 10,11		40.0	5.5	to 1
233	1,6,8 - 10,11		42.6	5.5	to 1
266	6,8 - 10,12		41.0	6.5	to 1
275	1,6,8 - 10,12		42.6	6.5	to 1
300	1,3,4,6 - 10,11,12		40.0	7.5	to 1
333	3,4,6,8	- 9,10	44.6	7.5	to 1
366	1,4,6,7	- 9,10	46.0	8.0	to 1
400	1,2,4,6,7,8 - 9,10		50.0	8.0	to 1

Chapter 4 - Advanced Performance Tuning

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1.Shut down your computer and remove the cover.

•To adjust the CPU to its maximum operating speed locate the current speed settings in the table at the left

•Keeping a consistent Ratio setting (switches 9-12), adjust switches 1-8 to the BUS Speed at the next highest setting, (refer to the table on the following page).

•Boot your system

2.Run your system at the new setting for at least 24 hours to determine that your system is stable at the new speed.

•If your card is running well at the new speed, then you can again follow the earlier steps to take your card to the next speed.

•If your card is running well at multiple BUS Speed set- tings above the standard BUS Speed settings, then you can also experiment with adjusting the Bus Ratio Settings (switches 9-12) on the card.

•When you reach a speed that is unstable. You should adjust your BUS Ratio to a .5x higher. This will allow higher processor speeds without being limited by the bus speed.

•Your system should be able to run memory tests such as TechTool Pro, DayStar’s PowerControl Testing software, or MacBench overnight, consistently.

Note: To find the maximum achievable CPU speed, the following steps can also be followed with the cache dis- abled. This allows you to determine the maximum speed that the CPU will run on the bus. Once a comfortable speed has been achieved, the cache can be enabled. It is normal, that the CPU speed will have to be lowered slightly to compensate when the cache is enabled.

Chapter 4 - Advanced Performance Tuning

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