Your i5-4670 can reach up to 3.8GHz even without changing the multiplier in BIOS. The reason why you only get up to 3.6GHz is that you most likely are using 4 active cores, you can only get 3.8GHz when there is only one core active. You can check the turbo boost frequency table here: http://www.intel.com/support/processors/corei5/sb/CS-032278.htm to get more information about your concern.
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