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Even with eight fans in its large, heavily drilled aluminum case, the G5, barely a foot from my chair, can't be heard over the relatively quiet iMac that sits in a corner farther away.
The G5 has three PCI slots, versus four in the G4 towers, two hard drive bays versus four in the G4, and room for only a single optical drive versus two in the G4.
Apple has advertised the G5 as the "the world's fastest PC," but current marketing verbiage refers to "one of the fastest PCs ever built." Apple claims that the G5 smokes Pentium 4 and Xeon processors in any number of benchmarks and application tests.