You read me right, and below are all the facts.
To start off, just so that you get a good idea about the Macbook Pro Retina 15″ model, you can go ahead and read the details in this article over from Anandtech: http://www.anandtech.com/show/6023/t…display-review
Note the part in the review where he talks about the GPU performance in the new retina Macbook Pro, and also when he talks about the improved heat venting solution on this particular model.
All of the rMBPs feature NVIDIA’s GeForce GT 650M equipped with 1GB of GDDR5. Apple went aggressive on the Kepler implementation and ships a full 384 core GK107 in the rMBP. The GPU clock is set at a very aggressive 900MHz with a 1254MHz memory clock.
Nvidia Specs for Nvidia GT 650M:
http://www.geforce.com/hardware/note…specifications (notice the UP TO 900 MHZ)
Nvidia Specs for Nvidia GTX 660M:
http://www.geforce.com/hardware/note…specifications (notice the 835 MHz)
Here they discuss and confirm this very topic:
So Apple clocked the GDDR5 version of 650M so high to actually be better than a GTX 660M.
Moreover, Anandtech confirmed that the new thermal design actually give for the first time in a mac notebook little to no throttling at all, even after going full-burn CPU+GPU for 20+ minutes:
So for the first time we actually practically have a ‘GTX’ top-of-the-class mobile GPUs in our macs. Awesome engineering feat with the thermal vents!