I'm pretty sure that B&W benchmarks indicated that the real-world benefit of 66 MHz PCI slots over 33 MHz PCI slots is something like a 10% boost.

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I remember seeing statistics like that, too; Latency acutually ends up having a lot to do with things like fill rate from RAM to framebuffer, not just raw bus speed.

Still, for hack value, this would be interesting. But it begs the questions: how would you verify that your PCI bus is operating at a full 66 MHz, and how would you test the throughput on the bus when your system bus can't saturate it?

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An oscilloscope could verifty 66MHz operation. }

As for the throughput, you'd just have to benchmark bus-stressing things before and after the hack; even though the system bus is faster than either 33 or 66MHz PCI, you'll never saturate either one of them becuase the PCI controller sucks and the memory controller sucks. (Where by "sucks" I mean "not designed with absolute performance above all other considerations. ")

The hope is that if you can saturate 50% of the 33MHz bus, you might be able to saturate 30% of the 66MHz bus, which would be a total increase of 10% bandwidth, even though the utilization went down.

If that webpage is for real, it does improve game framerates and disk throughput a little bit, which is pretty cool for just adding a different oscillator.