Ram mhz problem

[fener_bahce_1186]

First sorry for my english
My mobo Asus p7p55d
Processor i7- 860

I overclocked my Processor to 3.61 ghz i think stabilzy. I see my rem is 1600mhz 8gb single on ram. But i see 1066mhz on Windows task manager. I selected 1600mhz on bios. How can i do for run to 1600mhz.

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[fener_bahce_1186]

Help please