Can't seem to get i7 4770k past 4.2 ghz

[fatsantapro]

Using an i7 4770k 3.5 ghz turbo boost to 3.9 ghz.
I am a overclocking newbie by the way.

What I did was turn off turbo boost and set:
-cpu ratio to 42
-ring ratio is auto at 3.9
-DRAM is at 1600 mhz
-VCCIN voltage at 2.0V
-cpu core voltage at 1.25V
-DRAM voltage at 1.5V

Moving the cpu ratio to 43 will just bluescreen. not sure what I am doing wrong. I'm sure the temperatures are fine because stress testing at 4.2 ghz only maxes out at 60celcius. I'm seeing other people with the 4770k get at least 4.6ghz and Im not sure how I can get there. I'm wanting at least 4.5.

 

[theonerm2]

Some 4770K's won't overclock to 4.5GHz. Try 1.300 CPU core voltage. Don't go beyond 1.300v if on air.