PowerPC 604

The PowerPC 604 is a series of PowerPC processors used by Apple Computer in their second-generation high-end Power Macintosh systems. They were also used by Macintosh clone manufacturers, including Power Computing, which had marketed them aggressively. These processors were developed by the AIM alliance, which included Apple, IBM, and Motorola.
==Development history==
The PowerPC 604 was designed for high-end workstations and supported multiprocessor configurations. It featured an 16KB instruction cache and 16KB data cache, twice as much as early PowerPC 603 processors. Its 64-bit floating point unit could also execute instructions in half as many cycles as the 603.
==Processors==
*PowerPC 604 — introduced in the Power Macintosh 7600, 8500 and 9500 at 120 MHz and above.
*PowerPC 604e — used in the updated Power Macintosh 7600, 8600 and 9500 at 180 MHz and above. The 9500 offered a dual-processor option.
*PowerPC 604ev — higher speed versions (250 MHz and above) used in the 8600 and 9600.
===Successors===
Motorola produced a PowerPC 620 with upgraded features of the 604 in the first full implementation of 64-bit PowerPC architecture. However, real-world performance was poor and it saw limited use as integer performance of the PowerPC G3 exceeded it.Case Studies: The PowerPC 620 and Intel P6 (PDF) by Jon Kuhl, High-Performance Computer Architecture, The University of Iowa College of Engineering. 2009-04-11. Some elements of the 604, such as the 64-bit floating point unit, evolved into the PowerPC G4.
==References==
==External links==
*PowerPC 604 RISC Microprocessor Technical Summary at NXP (PDF, 1994-05)
**PowerPC 604e RISC Microprocessor Technical Summary (PDF, 1996-01)
*IBM PowerPC 604 and Motorola PowerPC 604 at CPU-Collection.de
*Mac Specs: By Processor: PowerPC 604, 604e at EveryMac
*CPUs: PowerPC 604 and 604e by Daniel Jansen at Low End Mac (2014-06-24)
*PowerPC 604 at Wikipedia