J'ai trouvé ça sur le forum anglais :
MacMini mid2011 & OSX Mavericks don't works with Rocksmith
I got MacMini intel core i7 2,7 GHz and with AMD HD 6630M 256 MB RAM but the funny thing under Windows 7 pro 64bit it works so perfect without problems is very fast, no problems with latency it works very directly with no lose of time or whatever, the tone appears in the same moment by shred the guitar. Under Mac OSX 10.9 it don't works, the game starts, after then Steam crashed and Rocksmith keep the screen frozen and nothing starts. I had changed the configs also in System Prefs for steam. Somebody got the same problems, too ????
but corious is also for other hand with my MacBook Pro, mid 2009, intel core 2 duo 2,66 GHz and 8 GB RAM and with nVidia M9400 / M9600 GT it works with OSX Mavericks with no problems, but the videos working slower.