Strange overclocking result

dilzy2

Reputable
Nov 19, 2014
8
0
4,510
CPU is a i5-4670k
GPU is a GTX 970
Motherboard is a Gigabyte Z87X-SLI
CPU Cooler is a Hyper 212 Evo

So I read on a guide on overclocking that said to start with small voltage increases so I did, I increased it very slightly and this is the result: http://snag.gy/TfRam.jpg

Ive left prime running for a while and no crashes with under 70 deg on all cores. The strange thing is others report much higher voltages (1.2ish) for a 4ghz overclock on a 4670k whilst mine seems to be running at much lower (1.157) have I done something wrong?