i5 5470k trying to get stable overclock suggestions

[russell664]

Hello guys,
I know there are numerous threads about overclocking the i5 4670k, but i have been messing around for around a month now trying to get a stable overclock, but my system is having non of it, so i want you ask you guys here, see if you had any idea's maybe?

Okay so my systems specs are as follows:

i5 4670k
Gigabyte Z87-D3HP
8GB Avexir 2400mhz RAM
2x 500GB HDD's
2x 250GB HDD's
630W PSU
In terms of cooling i am using the Bequiet! Shadow rock Pro SR1

As of now i don't have a dedicated GPU, so any problems relating to those can be ruled out.

So the problems i have been experiencing are as follows:
Random BSOD's ending in the x101, or x124 codes.
Random whole system lock ups, what even the reset button cannot make it reset.

Currently i am @4.1GHZ but even that still crashes, so what would be the best thing for me to do guys, what is the Vcore i should be at? Currently i'm @1.55 i think is that too high?

I'm pretty noob at all this, but i really want to get a 4.2ghz stable overclock, so what can i do to maybe get that?
Any help from you guys is greatly appreciated

Many thanks for reading.

 

[wazza300]

101 error is not enough cpu voltage

same with 124 error,but can also be not enough cpu memory controller voltage

1.55v isn't to high,might need between 1.2-1.3v for 4.5ghz