Quartz Extreme with Unsupported Video Cards
BandwidthHog writes "This thread over at Ars Technica discusses a simple .plist hack to enable Quartz Extreme on the PCI version of a supported video card, i.e. the original Radeon PCI and Radeon 7000, two of the most popular video cards for those of us running on 'unsupported' OldWorld machines."
I think those with Macintoshes with 66MHz PCI slots will see more benefits than those with the 33MHz variety. This is probably why some people see no difference with QE enabled versus disabled.