The PowerPC 603 was the second (1994) implementation of the PowerPC microprocessor architecture, and especially designed for low-power and embedded applications. Unlike the PowerPC 601, the 603 was a complete redesign, not based on IBMs POWER processors. It thus belongs to the "G2" generation of PowerPC CPUs.
The main performance bottleneck of the 603 are the small on-chip caches which make it slower than the 601. This problem was fixed with the 603e.
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