I have a new 21" iMac Retina with an i7 processor. Trying to install X-Plane, the log file reports
"CPU type: 1479463068 (unknown PowerPC) CPU speed (mhz): 3300 Bus speed (mhz): 100 RAM (MB): 16384"
I have a MacBook with an i7 processor and X-Plane runs fine on it.