Overclock memory ASRock Z77 Extreme 4 question / guide?

[asrock_z77]

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How to overclock memory on asrock z77 extreme4? Upgraded from stock bios on asrock support page. Auto timing settings - 2133mhz @ 9-11-10-27 1.5v 2x4gigs Corsair Dominator GT (9-11-9-27). If anyone has a helpful guide on properly overclocking ram, please post- or link to thread.