@Cyril said:
For a large orchestra a double Xeon is mandatory
Well, that's a question of how you define "large". 😊
For comparison, I just made a quick'n'dirty test on my own system (Intel Core i7-3930K CPU @ 3.2 GHz with 32 GB of RAM (1600), Windows 7 Pro 64), using a RME HDSPe audio card. An ASIO latency of 1024 samples @ 44.1 khz with MIR Pro's latency set to 2048 allows for 116 glitch-free simultaneous signal sources in MIR Pro (set to stereo) on this machine:
[url=http://postimage.org/image/qvneui0lx/][img]http://s10.postimage.org/qvneui0lx/MIR_Pro_Performance_Test.jpg[/img][/url] (... click thumb-nail for full resolution screen-shot)
... assuming that not all instruments will play all the time, it could very well be that in Real Life this number can be exceeded considerably due to MIR Pro's option to switch off any unused convolution processes (in its Preferences).
Kind regards,