A: Red stock jumper block

Each pin has a certain job to do. The illustration above shows what each pin controls.

The red block (may be a different color on your computer) (Fig.4, Arrow A) is where you configure the pins with jumpers on your G3 motherboard to take advantage of the new OWC Mercury ZIF chip. The red jumper block is Apple's way of setting a configuration for a certain speed.
Fig 5. shows jumper configurations. Black = Jumper / White = No Jumper

Tip: A needle nose pliers, tweezers or hemostats work really well for placing the jumpers on the logic board pins.


For more configurations go to the
Complete Jumper Chart.

STEP 3: Remove the jumper block off and keep it in a safe place. If you ever want to return your system back to factory stock, you can place the jumper block back onto the logic board.
Take the provided jumpers and install them in the proper order onto your logic board to configure your new ZIF to the desired speed.

STEP 4: If you are looking to squeeze top performance out of your new OWC Mercury ZIF chip, you can attempt to clock your CPU even higher than the rated speed of the ZIF chip. Follow the complete jumper chart for different bus speed configurations. We recommend either 66MHz or 83MHz bus speeds.

STEP 5: Start up your system and install cache controlling software. If you're running Mac OS 9, we recommend using PowerLogix Cache Control software located here, and if you're using Mac OS X, we recommend Ryan Rempel's Cache Control Software located here. You can also use PowerLogix universal CPUDirector software, located here.

STEP 6: Congratulations! After you have completed configuring the jumpers and checked to see if your computer runs stable, you can close the case, plug what you have back in and enjoy your new Mac!

NOTE: if your computer will not start up, you may need to reset the CUDA switch, it is a small gray button on the logic board at the top left of the system. It is located next to the PCI slot closest to the edge of the computer. Press the button with a ball point pen for 5 seconds and your system should start up as normal. If you are still unable to start your machine, please contact our tech support department.