The new GPU is equipped with 12 GB of GDDR5X memory clocked at 11.4 Gbps, 3840 CUDA cores clocked at ~1.6 GHz, and boasts 12 TFLOPs of performance. Nvidia will also begin developing drivers for Mac OS X.
http://www.notebookcheck.net/Titan-Xp-now-official-will-also-support-Mac-OS-X.211660.0.html