What is the significance of PCI/AGP Speeds?

[imported_RobJ]

I hear a lot of people say to set the PCI/AGP lock to 67 MHz. Would this hinder the performance of a 6800GT as opposed to using say a 75 or 85 MHz PCI/AGP lock? And why not just use the faster speeds? Does it affect overclockability?

System specs in sig...

 

[ChineseDemocracyGNR]

75 or 85MHz is too much for the video card (way out of the spec 66MHz), it would work incorrectly or not at all. There's no speed gain as far as I know.

 

[imported_RobJ]

OK cool. Well how about this question then: Why do some people say to set the speed to 67 instead of 66? I have this vague memory of people saying that setting it to 67 will suppress some symptoms that arise when the system is overclocked.

 

[LocutusX]

they say to set to 67, because on certain nForce3 motherboards, you need to set it to 67 for the PCI/AGP lock to function correctly.