I found it does give a slight performance boost, however, after that article the next day my PC had trouble booting. I ended up dropping it down and found that it was having issues with anything over 115mhz even tho when I ran those tests it was fine up to 130. Now I have it set at 110mhz, with no issues.
I've seen reports from earlier boards about raising the PCI frequency to 110 to help with stability, but that was from the P4 days. It also only helps with 96% stable boards. Meaning if you can't load windows, its not going to help. Considering the little gain you get, you might as well leave it at 100.