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EveryMac.com provides a variety of ways to view particular pre-Intel Macintosh processor upgrade cards of interest. Please select the one below that suits you best.
Please note that the Pre-Intel Macintosh Processor Upgrade Cards section of EveryMac.com was "archived" on April 4, 2005. There were some additional upgrade cards released after this point, but EveryMac.com covers the "heyday" of such processor upgrades below.
For upgrade instructions for G3 and later Macs, you may also be interested in reviewing the Mac Upgrades section of EveryMac.com.
Pre-Intel upgrade cards by company...
By Compatible System
Upgrades that work with vintage Macs...
Pre-Intel upgrade cards by chip...