Some G3 and G4 processor upgrades for beige macs from the 90s have dip switches for setting the processor and bus speed, as well as a special switch for when you install it in a PowerBase (a clone). With so much information falling off the internet and getting harder to find, I thought I’d post the settings for some cards here.

PowerLogix PowerForce G3 Speed Settings

This is what my PowerLogix card looks like, it is a 400MHz, 1MB Cache G3 (PFG3 400/200/1) upgrade for PCI macs with the processor slot, for example things like the 7500 to the 9600, and some clones.

Here are the settings :

XLR8 Mach Speed Settings

The following settings apply to a number of XLR8 cards, including Mach branded cards. The first 8 switches seem to control the host bus speed, the remainder set the CPU multiplier.

You can also additionally set the Backside Cache speed using XLR8s software.

Newer Technology MaxPowr

See the following site for experimental research regarding the four switches on the non-ZIF variant, or the manual extract for settings on the ZIF card.

https://siber-sonic.com/mac/MAXpowrG3.html