<http://schema.org/mainEntityOfPage>
<http://www.tweaktown.com/articles/3717/the_shader_difference_geforce_gtx_580_at_gtx_480_clocks/index6.html>
<http://www.tweaktown.com/articles/3717/the_shader_difference_geforce_gtx_580_at_gtx_480_clocks/index6.html>