Reaktor 4 Performance On G5 Duals?, how many (synth) instances are possible? Options

[Metalflkk]

Hi,
I am debating between getting a PC for running Reaktor 4 vs getting a G5 dual, mainly because I am nervous about the performance difference I've experienced so far, (PCs have seemed to run many simultaneous instances just fine vs. my mac which can only handle 1 or 2.) So, how many instances can a typical user get running Reaktor 4 in Logic6 or a comperable host? Can I expect to run 8-9+ instances of Reaktor synths in a Logic project? Thanks, any links to preformance benchmarks would also be appreciated!