put on your glasses?
Nehalem works with a base clock which gets multiplied to create cpu clock, qpi clock and imc clock. other than amd which used 200Mhz as base, Intel is using 133Mhz as base. the base clock works pretty much like the fsb, as in cpu clocks is multiplier x Bclock. Just like with amds hyper transport the bus speed is created using the base clock and a bus multiplier.
So when you overclock the base clock to get a higher fsb and better throughput for the cpu, the qpi speed will come up as well.
so to max out the Bclock you need to lower the qpi multiplier, just like with amd... even when changing the qpi multiplier the max Bclock is around 220, so with the 920 you guys will be limited to 20x220=4400Mhz. Which is fine tho, to max out a chip on air the base clock limit is just fine, but when you go for ln2 or phase change the 220 will be limiting.





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