Intel Iris Pro vs Nvidia Geforce GT 650M?

I currently own the late 2013 model 15 inch Macbook Pro Retina with the 2.0 ghz processor and Intel Iris Pro 1024mb graphics. Before this, I owned the older Macbook Pro Retina model with the Nvidia Geforce GT 650M graphics. I am curious to the differences of the two, could someone explain to me in detail?

Thanks!

SenileT

AnandTech | Gallery - Intel Iris Pro vs. NVIDIA GeForce GT 650M Image Quality - 14 Photos

Being a non-gamer, I cannot detect any appreciable difference. Physically, the GT 650M is a discrete card and the Iris Pro is an integrated chipset, but Intel has been making huge progress on their integrated line for some time now and I think the time of the discrete graphics card in consumer computers* is coming to an end. Also, Intel systems don't have Nvidia's annoying tendency to have driver issues, overheat, destroy your machine, etc.

*Pro machines like the top-line MBPs and of course the Mac Pro will probably always have discrete options. I'm talking about iMacs, low-end MBPs, non-gaming-specific PC machines, etc.

Macworld Magazine has yet to test your machine for benchmark or speed, however, the tests that they have made still show discrete graphic chipsets to be faster than the best that Intel has put forth. (The Iris Pro) But chas_m may well be right as Intel continues to improve the integrated on board graphic chipsets they supply. I personally would have no problem buying a machine that had the Iris Pro, but I'm also not a gamer.