The Sandy Bridge i7 2600, non-k, can achieve a limited overclock, from what I read and achieved, without the BCLK, close to 4.2 GHz, at 34+4+4 -> 34 base & +4 (multiplier) & +4 (turbo) using the Z68 and Z77 chipset and if the Motherboard manufacturer allows it, which Gigabyte does on the two...