^exactly! I'll end up with the same QPI speed, but on the 930 I'll have been able to get a higher OC than on the 920 (thanks to the extra head room allowed by the higher cpu-qpi ratio)
That's all a big maybe. With the higher Multiplier you'll more than likely have to reduce your QPI. If your QPI limited I would suspect the mobo, memory or a bios setting or 2.