My knowledge of overclocking is rusty and I don't really grok the architecture of the i5/i7 systems. I know you can overclock by increasing the FSB from the default value of 133. On *old* PCs, increasing the FSB past 133 would affect the PCI/IDE speeds because they were on a fixed divider relative to FSB. So if you pushed the FSB too much you were at risk of problems with the hard drive and PCI peripherals.
Is this still the case with the i7/i5? Or is the FSB disconnected or independent from stuff like the PCI/IDE frequency?