Graphics memory scaling in Mavericks

[Starfyre]

In the keynote, Craig Federighi talks about how Mavericks is able to dynamically use only the necessary memory it needs to get the work done. Does this apply specifically to the Iris/Iris Pro? Or does this apply to the 750m also?

 

[priitv8]

What sense would it make for 750m that has it's own dedicated VRAM?
The announced benefit was leaving more RAM to running apps and only the Iris shares RAM with CPU (ie apps).