Videogames and 1080p HDTV's

If I play my 360 on a 1080p Samsung (37") will I see lower performance due to the higher resolution ... like when you play a pc game at a higher resolution...things sometimes get more clunky???

Just need to know as I decide between getting 720p or 1080p on a new Samsung 37" LCD TV.

The 720p runs games fine but I'm wondering if the 1080p would run them as well.

The Xbox 360 has a dedicated hardware upscaler. Most games render natively in 720p. That means that the GPU generates the image at 1280 by 720, then an unscaler turns that into a 1920 by 1080 (1080p) image to send to the TV. Since the upscaler is serparate hardware, it shouldn't have a noticable effect on framerate.

Even so, you have an LCD TV, so that means that the 1080p resolution is made up of physical 1920 by 1080 pixels. Any content you play through that TV that is not 1080p will have to be scaled over those phisical pixels, instead of scanning in native, like a CRT TV. Basically, even if there wasn't a dedicated upscaler (like in the PS3) I would still sacrifice a few FPS to get native on the TV. And the 360 and PS3 upscaling is probably better than that built into your TV.