Currently have PCI-e set to 100 and i'm getting 16x link width. My FSB is set at 333, but is running at 332. When I set to 334, it runs at 334. Anyway, I seem to be able to get 16x link width at 100mhz PCI-e locked and 333 FSB STABLE by upping the voltages. I'm running at +.2 on DDR and MCH, +.1 on FSB and PCI-e, and 1.362 on the vCore, which is all standard for a low-OCing system.
Setting to PCI-e from Auto to 100mhz didn't work at first, at least with the settings I had at that time.