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neon is right about the # of cores and the work they do; unless you have eg. multi-threaded applications or server apps with lots of background processes, the 4 cores might be mostly unused, and the faster clocked dual core would do fine.
On the other hand...
The water cooled Power Macintosh G5 "Quad Core" (2.5) was one of the first and last Power Macintosh G5 models to use dual core PowerPC 970MP (G5) processors, which have two independent processor "cores" on a single silicon chip.
The Power Macintosh G5 "Quad Core" (2.5) is powered by two "dual core" 2.5 GHz PowerPC 970MP (G5) processors with four optimized AltiVec "Velocity Engine" vector processing units (one per core), eight double-precision FPUs (two per core), 1 MB of on-chip level 2 cache on each core, and dual bidirectional 1.25 GHz frontside system buses (one for each processor).
This was in 2005. Macs didn't use Xeon (which was intel, G5 was PPC) until 2006 (dual 5100 series) and xeon quad core in 2009 (iThink).