During the past week-end the guys from HKEPC showed some BCLK overclocking regarding Intels upcoming Haswell processors. The guys put a video on Facebook, showing on of their test systems and it was running at almost 200 MHz BCLK.
In the following video the guys from HKEPC were using an upcoming Haswell motherboard and the BCLK was jumping between 197.17 and 197.20 MHz. With this frequency they were able to boot into Windows 7 and they could even run SuperPi 1M stably.
Source:
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