I'm playing Borderlands 1 GOTY (Game of the year edition) from the App Store. Tried playing it only with the Iris Pro, instead of the Radeon R9 370X, and the performance is stunning.
However I get this weird pixel like texture on the screen. It doesn't move or blink, and it doesn't seem to effect the HUD or menus.
It seems to be "exactly" the same texture no matter what and it gets more detailed when I up the resolution.
I've tested Deus Ex and Bastion with the same setup and they have absolutely no problem. It seems like a OS X driver issue, I've seen graphics card's problems in the past and they aren't that stable or selective.
Can anyone confirm?
PS. Use gfxCardStatus to change to Integrated Only.