White Paper

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PowerPC G5

For comparisons that more accurately demonstrate the performance of a dual proces- sor system, VeriTest used the “SPEC rate” metrics, which recognize multiple processors. With SPECint_rate_base2000 and SPECfp_rate_base2000, the benchmark code is compiled and multiple copies are run concurrently, allowing both processors to work in parallel. SPEC rate tests determine the number of times a system can complete the benchmark per hour, also referred to as system throughput.

SPEC CPU2000: Dual Processor System Throughput

SPECint_rate_base2000: Integer calculations

Power Mac G5

 

 

 

17.2

 

 

 

Dual 2GHz PowerPC G5

 

 

 

 

 

 

 

Dell Precision 650

 

 

16.7

 

 

Dual 3.06GHz Xeon

 

 

 

 

 

 

Dell Dimension 8300

 

10.3

 

 

 

 

 

3GHz Pentium 4

 

 

 

 

 

 

 

 

 

 

 

 

0

10

20

SPECfp_rate_base2000: Floating-point calculations

 

 

 

 

 

 

 

 

 

 

Power Mac G5

 

 

 

 

15.7

 

 

 

 

 

 

Dual 2GHz PowerPC G5

 

 

 

 

 

 

 

 

 

 

 

Dell Precision 650

 

 

 

11.1

 

 

 

 

 

 

 

Dual 3.06GHz Xeon

 

 

 

 

 

 

 

 

 

 

 

Dell Dimension 8300

 

8.1

 

 

 

 

 

 

 

 

 

3GHz Pentium 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

10

20

 

SPEC score

 

 

 

 

 

These results clearly demonstrate the benefits of the dual processor Power Mac G5. With full support for symmetric multiprocessing, dual independent 1GHz frontside buses, and two floating-point units per processor, the dual 2GHz Power Mac G5 completed the set of floating-point calculations 95 percent faster than the Pentium 4–based system and

42 percent faster than the dual Xeon-based workstation. Integer performance was also

far superior to the Pentium 4–based system and on par with the dual Xeon-based system.3

For a detailed report of SPEC CPU2000 test results, see www.veritest.com.

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Apple PowerPC G5 manual Spec CPU2000 Dual Processor System Throughput