After some searching and chatting with apple reps online, i have discovered that the RAM is indeed DDR3 2133MHz, which does indeed exist, and while 2133MHz DDR3 is the upper limit of DDR3 memory speed and it is the base DDR4 memory speed, there has been extensive research that concludes that there is a negligible difference bettween 2133 DDR3 and 2133 DDR4.
I asked multiple reps about the performance of the Radeon Pro 460. the first rep tried to tell me that it is on par with a GTX 1080, GTX 1070, and R9 Fury-X. The second Rep that i talked to was not able to give me much information, as they dont actually have all that much.
On my own i have concluded that the performance of the Radeon Pro 460 probably falls around the GTX 960M (which has 1.4 TFlops) and possibly the GTX 965M (which has 1.9 TFlops), which does give decent gaming performance.
So take all this with a grain of salt, if you have any questions about my sources let me know