Thanks for all your comments

Because we thought that the G5 was the best machine on our network, and trying the rendercows network rendering before proved reasonably dodgy ( a couple of nights renders messed up ) we have been just using the G5 mac.  We planned to link the new macpro up to the existing G5 to (well at least, we thought, get DOUBLE the render speed)

It looks like maybe our G5 doesn't compare very well to the macpro - is our thinking right that it would be the best to link to the macpro for network rendering?

Would you folks agree that we really need to utilize ALL of the reasonably decent machines on our network for network rendering? ( I think it was before the fix of 5.11 that we had our problems - we didn't really try after that as we had looming deadlines!!)

again, thank you for all your input - it is v. helpful