What is the screen size after you most suited to MALI 450 mp ? Of course it can support 1080p . But I think that the processor will be more comfortable with a 720p right ? refresh screen can be more improved in 1080p ?
The answer is "depends". In fragment bound applications, you will do less work with a lower resolution, and have an improved frame rate. This is also true in some cases when you are bandwidth bound. If your application is geometry bound, you can possibly increase the resolution without effecting a change in fps. Really it depends on the application, and a host of SoC specific factors like clock speed, memory bus width/clock, etc.
That said, Mali 450 is being deployed in plenty of 2160p designs, so 1080p should be no trouble!
Hth,
Chris
It's also worth noting that Mali-450 can scale up to 8 fragment shader cores, so if you really want to push lots of pixel effects (resolution or more detail) it is definitely possible. 1080p isn't really much of a challenge