AGP voltage

[Geeky1]

How much of an impact on video card overclockability can increasing the AGP voltage have?

I wouldn't think it would be much, since you're talking about the signaling voltage, which shouldn't have anything to do with the vcore/vmem on the graphics card...

I suppose it could allow you to run higher AGP frequencies, though.

Speaking of which, is there a defined standard for where video cards get their reference clock? Specifically, do they use the AGP bus as a reference, in which case increasing the AGP frequency would result in overclocking the GPU and the memory, or does raising the AGP clock simply overclock the bus itself?

[Thrax]

Raising the signalling voltage does nothing to aid the card in overclocking, as the onboard voltage regulators are still tuned to bring it down to a nominal level.

As far as higher AGP frequencies are concerned, anything higher than 66MHz has been proven to return no performance increases. Raising the AGP clock simply raises the bus itself, but too high and the card has trouble keeping proper signal timings, freaks out and the computer doesn't boot and/or crashes consistently. Just like PCI.

AGP cards get their reference clock from onboard clock generators.

[Geeky1]

Hmm. Then what's the point of the AGP frequency/voltage tweaks in the NF7-S BIOS? Just two more things for us to screw around with? :D

[Thrax]

I've never determined the purpose of their being there; they serve no positive or negative need.