Just bought the Xbox 360 premium with HDMI. Hook up to Sony LCD 46V2500 1080p.
Does anyone know if there is a frame rate difference running Xbox in 1080p over 720p? The picture on my TV is a touch better when I run the Xbox in 1080p but it seams the frame rate suffers slightly. I’ve read a lot of comparison for the picture quality depending on the scaler in TV vs Xbox but what about the FPS? Is the Xbox scaler/CPU paying penalty for this or is it just a software size scaler and no difference in FPS?
Also, if the game is 720p 60FPS and you use the Xbox scaler to 1080p is it running 1080p 60FPS or 30 FPS?
Thanks

It's gonna run the same no matter what, your 360s scaler is just scaling instead of your TV and by no means is that putting any added stress on the GPU or CPU. If the framerate is dipping it's the game.

Thanks for the answer, it just I keep thinking PC where it would be a big difference playing in 720p or 1080p which is 1920x1080. No way my PC could play a game like Halo3 in that resolution

Thanks for the answer, it just I keep thinking PC where it would be a big difference playing in 720p or 1080p which is 1920x1080. No way my PC could play a game like Halo3 in that resolution

That's because you are comparing two competely different things:

Your PC running a game at 1080p is because the game engine is rendering at 1080p and your Video Card has to support it
The 360 is rendering the game at 720p (or less) and the internal scaler is "up-sampling" the image to 1080p. This is far less processor intensive than doing native 1080p, and the end-results reflect this.

Consider a chipped XBOX 1 running XBMC: It can upscale DVD's to 720p/1080i but it can't play HD Video at those resolutions because the CPU isn't powerful enough.