4790k OC with Gigabyte Z97-UD3H

[Abroad87]

I found it quite stable @ 4.6GHz with Vcore 1.248v and VRin 1.778v. I found it quite low compared with others data. And I don't see much improvement over 4.4GHz. Can anyone explain that?

My config:
Air cooler (Max Temp 77C running Intel Extreme Tuning Utility)
Cache 4.2GHz
DRAM 1600 8-9-8-24-1T

Next Step I would like to update the DRAM to maybe 2133 or 2400. Will that be much helpful?
My current Intel Extreme Tuning Utility Score is 1036.

 

[4K4M4]

Silico lottery. When overclocking, other results obtained using your CPU are irrelevant. Some people get good OC results on a given CPU, some don't using the same CPU model. Since you're running air, 4.6 is a nice bump already - though you could go more if your cooler can handle the heat. As you said yourself, the voltages values are quite low compared to other 4790Ks, and I think you can push them a little bit further to get better results. Try bumping the voltages and see how your CPU reacts.

You can also try increasing the DRAM. 2133 is a massive increase from 1600, though you may have to sacrifice your latencies if you're aiming any higher than that. You could try to watercool your CPU if the temps prove to be a challenge - though I do think you could go a little bit higher than that on air.