overclock i7 4770k

STRIKERMAGIC

Honorable
Jun 24, 2013
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10,630
hi, i have this cpu on asus z87 plus.
asus bios have one optimal mode (standard, power saving and turbo ( asus optimal ) )
in normal mode, the speed its about 3.5-3.8 ghz (stock speed)
in turbo mode it goes to 4.20ghz (max)
the voltage is always the same (in turbo and standard) : 1.040v

my question is: is it possible overclocking it more ( without risking to damage it, only at safe voltages ) ?