Download the required software for your Sonnet G3 or G4 upgrade card.
This unified installer software is required with Crescendo/7200 G3 and G4 processor upgrade cards, and installs the proper software enablers, as well as the Metronome utility, into your System Folder. This software is specifically for the Power Mac 7200 and 8200 and is the only software required.
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My experience with the 400/G3/521 cache card has been very good. Easy to install. I have 5 dimms , everyone of them different makes, models, and vintage; and I am impressed with the speed . I am now able to view shockwave sites with ease ( notoriously crash-prone) and have actually had inceased surfing stability.