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Software compiling for a couple of SuSE releases in parallel. From the Ghz point of view, the 8610 is already Pegasos Ghz + EFIKa Ghz. But it also has at least 3x faster RAM and HDD access (30x, when compared to the EFIKA). Distributing compile tasks also have heavy networking overhead.
wait, is that pegasos 74xx or 750? if it's the former then that alone should give you 8610-levels MIPS, and 3x efika should add some extra 2300 MIPS - that deciseviely outdoes a singe 8610 for purely-computational, distributed tasks. memory-throughput-wise the 8610 likely outclasses the efikas handily (and that is before considering the big L2$), but still, i'm not sure that a task such as compilation would be so heavily biased toward mem throughput, that an 8610 would outdo an 1x 74xx + 3x 603e cluster. maybe you're heavily disk-bound (read: swap-bound) during that build? apropos, did you try distcc for the distrubuted builds? if you did, i'm curious about the observed cluster performance.