The reference site Barefeats compared the new G5 1.8 GHz Powermac with a 600 MHz bus, to the older 900 Mhz model, and to a a dual 1.8 GHz.
Against all exepectations, the FSB frequency loss doesn't have much impact on overall performances.
In fact, what's most important is to replacer the overaged Geforce with a Radeon 9600 XT.
http://www.barefeats.com/g518.html
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