Here are the specs of my iMac:
iMac (27-inch, Late 2013)
Processor 3.5 GHz Intel Core i7
Memory 24 GB 1600 MHz DDR3
Graphics NVIDIA GeForce GTX 780M 4096 MB
It is still a pretty capable machine (just annoyed by the black fogginess on the bottom of the screen), but I made the mistake...