Sorry to dig up an old thread, but does anyone have any feedback on the new Early 2013 rMBPs? How do they perform in the gfx test? I'm thinking of getting a maxed out 15" but I don't want to spend so much and be disappointed by UI performance, especially when I'm used to my silky smooth Mac Pro with Radeon HD 5870.
In the Apple shop, scrolling in Mail still seemed very laggy with some of the picture-heavy example emails. However, all the demo units are set to switchable graphics so I assume that Mail was using integrated graphics. Unfortunately, this setting is locked so you can't change it to force use of the discreet card.
Given that the computers are plugged in all the time, I find it strange that they went with a lower performance setting when using discreet graphics would probably provide a better demo and smoother UI performance. Of course there's no point asking the Apple staff because they tell you that they can't change it.
I've been searching a lot but find a lot of varying and conflicting information on whether the discreet card does any better. In theory it should right?
I guess I can always buy it and return it if I'm not satisfied.