With a Sonnet Crescendo/PCI G3 or G4 processor upgrade card, you can accelerate your PCI Power Macintosh® to the leading edge. The Crescendo/PCI incorporates a revolutionary PowerPC G3 or G4 processor and ultra high-speed Level 2 or Level 3 backside cache for unmatched performance.
The Crescendo/PCI is compatible with your existing hardware. It seamlessly integrates with your software, supporting System 7.5.2 up to the latest version of Mac® OS version 9.1, or even OS X. When you upgrade with a G4, even greater performance improvements are possible with AltiVec-enhanced applications.