Today I upgraded my rig to add more memory - now a total of 24gb. I could now test Caen surround out with all the ranks loaded to their best. What better way to test than a piece which requires large held chords on fff dynamic? (Well apart from Widor's toccata first, to test that it could handle speed!) The test is why it is at a slower pace than normal!
The rig handled this full organ piece, with Grand sub-octave coupler on, albeit with a lower polyphony rate. Seems promising so far for this old AMD FX processor. Setup not up to 'pro' standards, but fine for my purposes!