It's sort of hard to guess because a lot depends upon the amount of MIDI data being called upon and the rate of speed required-- ie: faster notes make your system work harder.
But based upon the stats you listed of loaded VIs, voices, and CPU load, it would seem that you could, at the very least, double that amount on a 2.5 and 2.7. The .2Ghgz difference between the two CPUs may be less of an issue as the 2.5GB RAM bump on the 2.7. This may result in another variable which adds to the difficulty of guesswork.
The question really is what specific instruments/samples are loaded with the amount of voices and instances you posted.
In a nutshell, to run a full orchestra on both machines you would need to run (only as an example) winds and brass on one machine with percussion and strings on the other.
Just taking your stat of 24 instances on one machine, a good place to start would be to see if the winds you need would fit into 12 of those instruments and brass would fit into the other 12. Of course, 12 + 12 could be adjusted to any two numbers equaling 24 instances as the project requires. A similar approach would be taken for 24 additional instances on the second machine.
Also noteworthy: which two orchestral sections on any one machine would be entirely at the discretion of the user: winds/strings + perc/brass, strings/brass + winds/perc, etc, etc., etc.
The final questions pertain to whether what can be loaded as such would be enough or practical for your purposes where fx and some CPU headroom would be needed for mixing.
Answer #1: Yes, you should be able to get a lot done with these two machines with a full understanding of the limits of available resources.
Answer #2: No, with the understanding that many users are putting 3 or more machines (sometimes 8 or more) to work to run all that they need.
Important phrase: "all that they need".
Sort out more specifically what *you* need in the way of instruments and weigh that against your resources. Only then, reconcile your needs with your available resources. At that point, it will be easier to decide how a third machine would serve your needs.
By this, I mean that you should load up your ideal string section on one machine and with the remaining resources load up a wind or brass section. Delete or add samples as needed to make the most what the machine can reasonably handle. For example-- you may opt not to use muted strings on a project to save resources where muted brass would be more important in your template.
But based upon the stats you listed of loaded VIs, voices, and CPU load, it would seem that you could, at the very least, double that amount on a 2.5 and 2.7. The .2Ghgz difference between the two CPUs may be less of an issue as the 2.5GB RAM bump on the 2.7. This may result in another variable which adds to the difficulty of guesswork.
The question really is what specific instruments/samples are loaded with the amount of voices and instances you posted.
In a nutshell, to run a full orchestra on both machines you would need to run (only as an example) winds and brass on one machine with percussion and strings on the other.
Just taking your stat of 24 instances on one machine, a good place to start would be to see if the winds you need would fit into 12 of those instruments and brass would fit into the other 12. Of course, 12 + 12 could be adjusted to any two numbers equaling 24 instances as the project requires. A similar approach would be taken for 24 additional instances on the second machine.
Also noteworthy: which two orchestral sections on any one machine would be entirely at the discretion of the user: winds/strings + perc/brass, strings/brass + winds/perc, etc, etc., etc.
The final questions pertain to whether what can be loaded as such would be enough or practical for your purposes where fx and some CPU headroom would be needed for mixing.
Answer #1: Yes, you should be able to get a lot done with these two machines with a full understanding of the limits of available resources.
Answer #2: No, with the understanding that many users are putting 3 or more machines (sometimes 8 or more) to work to run all that they need.
Important phrase: "all that they need".
Sort out more specifically what *you* need in the way of instruments and weigh that against your resources. Only then, reconcile your needs with your available resources. At that point, it will be easier to decide how a third machine would serve your needs.
By this, I mean that you should load up your ideal string section on one machine and with the remaining resources load up a wind or brass section. Delete or add samples as needed to make the most what the machine can reasonably handle. For example-- you may opt not to use muted strings on a project to save resources where muted brass would be more important in your template.