Thats just a old rule of thumb, depending on how high your overclock is. The pci-e and pci buses will usually raise along with the fsb of the processor overclock, and causing corruption in the devices on the bus.
For example, too high of a pci-e can cause you to lose LAN, get video anomolies, and loose connectivity to your hard drive.
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Originally Posted by burn
also put asus hyperpath 3 from disabled to AUTO ... i was like when i saw SANDRA memory bandwith test went from 65xxx to 68xxx ... so far i dont have issue .. even vista is happy with the OC
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Actually, I think thats primarily due to the enabling of hyperpath 3. Hyperpath 3 basically allows speedier data transfer between the northbridge (memory control hub) and your ram.
However this has been known to cause FSB walls at higher overclocks due to tighter timings. As long as its stable for you, go with it.