Apple PowerPC G5 manual Spec CPU2000 Dual Processor System Throughput

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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.