Ace's Hardware heeft een aantal rauwe PowerPC G4, Pentium III en Athlon SPECint95 en SPECfp95 benchmarks van het net geraapt:
One should look at the PPC architecture page first to see what kind philosophy PPC architects have in mind. Then it time to jump to the G4 main page at motorola, where one get CPU die porn and some SPEC95 numbers(21.4 specINT, 20.4, specFP at 450MHz, probabily with 2MB 1/2 speed cache). From the Spec scores G4 is about 0.04756 SPECint95 per MHz, and 0.04533 SPECfp95 per MHz, while K7/Athlon (at 550MHz thus longer memory latency) rates at 0.04564 SPECint95 per MHz, and 0.03745 SPECfp95 per MHz, and PIII 500 XEON with 2MB L2 clocks in at 0.045 SPECint95 per MHz, and with 512KB L2 0.0318 SPECfp95 per MHz. This shows that G4 is about on par with top x86 CPUs in integer per clock while beating them in floating point, however due to short pipeline it suffers from a lower clock rate, much like K6 series. However consider the price, without L2 the 450MHz G4 cost 355 USD, $100 over the K7 500MHz version which does include L2, thus from $$$$ per performance point without enough Altivec softwares, the G4 is still not as attractive as the x86 offerings.
In een tabelletje ziet dat er zo uit:
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Over de G4 kan ik weinig zeggen, maar de floating point scores van de Athlon lijken me t.o.v. de Xeon nog vrij laag. In de praktijk is de Athlon 50% sneller in pure floating point performance. Een Xeon zal daar met z'n 2Mb L2 cache weinig aan kunnen veranderen.
