So I know both the retina screen and the TB screen both have high resolutions? So what's the difference? My understanding of retina is that it's just doubling the pixels so for every pixel there (say) 4 pixels. So by doing this, this helps not make everything looks so tiny on the 15inch screen. So if there was no pixel rendering (upscaling or whatever you call it) and you just ran the rMBP at the native resolution that native resolution is the same as the TB display's right? The only difference is that the TB display dosen't have the scaling because it can fit the native amount of pixels without it having to be all tiny like the 15 inch screen. So is scaling just a software thing? And if it is, couldn't (if we wanted to) tell the TB display to scale (where as in the rMBP it's the opposite and we can make it run native res). Sorry if confusing!