the notion that it affects your gaming under all situations is a bit misleading, that's for sure
however, it's true that certain games will experience this stuttering effect when certain graphical scenarios are being used i.e. certain combinations of anti-aliasing at certain resolutions
the 4870x2 seems to have remedied this completely, however. i would feel bad not at least bringing the issue to light, as some people will experience it and will have to customize their settings around the issue
here's the anandtech preview of the 4870x2:
http://www.anandtech.com/video/showdoc.aspx?i=3354&p=1