There are many ZIF CPU modules on the market now; most are compatible with the CarrierZIF. The exceptions were originally mentioned in my First Look and Review of the CarrierZIF.

Why are these 'hard-wired' (bus/CPU ratio fixed on the ZIF) not compatible? Because these ZIF models are set to a fixed Bus/CPU ratio which cannot be changed by the CarrierZIF card and one that assumes a 66MHz or higher bus speeds of the Apple G3s. Since the CarrierZIF (in most macs) can't run near a 66MHz bus speed you will never be able to run the CPU at the rated speed (since bus speed times ratio = CPU speed).

Here are a list of ZIFs that are compatible (this is not a complete list):

• XLR8 ZIFs (some models have jumpers, others not)
• Mactell/Bottom Line Railgun ZIFs (most have a bus/cpu ratio adjustment switch - see this 466 model)
• PowerLogix ZIFs (some models may have a tall switch that may require using another heatsink)
• OWC ZIFs (most all are now compatible & they have Card/ZIF bundle offers now as well)
• OEM (original equipment) ZIFs: Most are jumperless (CarrierZIF then controls bus/cpu ratio). Many vendors now resell Apple and Motorola/IBM OEM ZIFs that should work fine. If in doubt - ask before you buy.
• Apple Beige G3 and B&W G3 ZIFs

If you have any doubt about compatibility, ask the vendor of the ZIF if it is compatible with the CarrierZIF. See my CPU Cards page for reviews of various models of G3 ZIF upgrades.

The next page of this guide covers applying the CPU gasket, thermal transfer compound and installing the ZIF module on the card. for use with the CarrierZIF. Or you can use the links below to jump to another part of this guide or other related links.