Actually I'm happy Apple didn't go for Iris Pro in the base 15" as it allows me buy a 15" with 460 and to be honest the fan at ~2000 RPM manages to keep the laptop cool even during rendering with Fusion 360Especially considering Apple decided not to use Iris Pro 580 in the 15". Unless they use it in the new 21" iMac, then I wonder if Apple is done with Iris Pro.