Apple PowerPC G5 manual Industry-Leading Performance, Spec CPU2000

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White Paper

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PowerPC G5

Industry-Leading

Performance

Ultrafast clock speeds and a highly parallel 64-bit architecture make the PowerPC G5 ideal for next-generation multimedia, graphics, and scientific applications. Integer and floating-point math calculations are faster than ever thanks to 64-bit-wide registers and data paths.

To demonstrate the performance advantages of this groundbreaking new processor, Apple put the dual 2GHz Power Mac G5 to the test against the top-of-the-line Pentium 4– and Xeon-based systems, the 3GHz Dell Dimension 8300 and the dual 3.06GHz Dell Precision 650, respectively.

SPEC CPU2000

The Standard Performance Evaluation Corporation (SPEC) CPU2000 benchmark suite is the recognized industry standard for assessing processing performance. SPEC is a nonprofit organization of hardware and software vendors, universities, and consultants. They developed the SPEC CPU2000 benchmarks based on actual end-user applications. These tests depend on processor, memory subsystem, and compiler performance when executing integer and floating-point computations. For more information on the bench- marks, see www.spec.org.

Apple hired an independent laboratory, VeriTest, to conduct the SPEC CPU2000 benchmark tests and provide documented results. Since SPEC CPU2000 measures the performance of both the hardware and the compiler, VeriTest normalized the compiler on both platforms to allow for a direct comparison of hardware performance alone. VeriTest used GCC—an open source compiler popular with programmers around the world—with similar settings on all systems. (Even though GCC cannot automatically generate Velocity Engine code for the PowerPC G5, settings included automatic genera- tion of optimized SSE/SSE2 code for the Pentium 4 and the Xeon.) The Power Mac G5 used Mac OS X v10.2.7 (G5), and the Intel-based systems used Red Hat Linux 9.0.

The SPEC CPU2000 benchmark suite comprises four metrics—SPECint_base2000, SPECfp_base2000, SPECint_rate_base2000, and SPECfp_rate_base2000—to represent different performance characteristics of the system.

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Contents White Paper July PowerPC G5Contents Introduction Key FeaturesMemory Addressing up to 18 Exabytes An Exponential Leap in Computing PowerFull Support for Symmetric Multiprocessing High-Precision Calculations in a Single Clock CycleClock Speeds up to 2GHz Industry-Leading 1GHz Frontside BusNative Compatibility with 32-Bit Application Code Ultrafast Access to Data and Instructions Next-Generation PowerPC ArchitectureAggressive Queuing and Register Renaming Highly Parallel Execution CoreTwo Load/Store Units Optimized 128-Bit Velocity EngineTwo Double-Precision Floating-Point Units Two Integer UnitsState-of-the-Art Process Technology from IBM Condition RegisterThree-Component Branch Prediction Logic Spec CPU2000 Industry-Leading PerformanceSpec CPU2000 Single-Processor Speed Spec CPU2000 Dual Processor System Throughput Wide execution core Technical SpecificationsBit PowerPC processor architecture Frontside busThree-component branch prediction logic Physical specificationsComparison of PowerPC G4 and PowerPC G5 For More Information
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