The G5 used in this benachmarks is a singlecore G5 (PowerPC 970FX) at 2GHz and it is compared with a dulacore PASemi wit 1,7Ghz
One of these papers compares 970FX 2 GHz (single core) to PA6T 1.7 GHz (dual core), the other 970FX 2 GHz (two CPUs) and 8641D 1.5 GHz (dual core) and PA6T 2 GHz (dual core).
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Apple used it up to 2,7Ghz and a dual core variant would have double the speed of it.
Yes, two 970FX CPUs at 2.7 GHz. Most powerful Apple Power Mac G5 model has two 970MP 2.5 GHz CPUs (in summ 4 cores).
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So it seems the the 2 x 970MP used in a 1900$ YDL workstation where a lot faster and had a much better performance / dollar ratio.