Intel plans to deliberately limit Sandy Bridge overclocking

[Hornet331]

Yeh but we had Blck in i7 which is similar to the front side bus "fsb" now we have DMI which is similar to blck, so who knows?

You still have a reference clock aka base clock and from this clock all other clock domains are sprung off. The difference is, that for mainstream SB you have locked DMI and PCIE multiplicators. So if you increase reference clock you also increase both of this clocks.