A graphics rendering system, comprising: a rendering unit configured to render image content for display; and one or more sensors respectively operable to detect a temperature within or proximate to at least a respective part of the graphics rendering system, wherein if a value of at least one of the detected temperatures meets or exceeds a respective threshold value, then the rendering unit is configured to render a first part of the image content at a first image quality and render a second part of the image content at a second image quality different from the first image quality.