Originally Posted by Unoriginal Sin
No, that's far from a great motherboard, and no, that's not how it works.
1'st, For good electrical performance to have an impact on overclocking, you need a motherboard capable to take advantage of it, and even so, you'll see a considerable impact only when pushing the CPU really really hard.
The same is true for VGAs... essentially, a high quality VRM(being it a GPU or CPU VRM) in conjunction with a high end power supply, allows you to push your overclocks as far as the chip itself will allow(GPU or CPU).... so the only constraints you'll run into will be the quality of the silicon and the cooling provided.
2'nd, Ripple and noise are being filtered by capacitors(the ones around the socket in the case of the CPU).. on a good quality motherboard, with a properly sized, quality VRM, nothing really passes... no ripple reaches the CPU(this is true for most mainstream boards and pretty much all high ends)... but in the process of filtering the current, the caps generate heat, which degrades them over time and they also heat the PCB around them, having an impact(marginal at worst) on the performance of the rest of the VRM components.
All in all, everything that's half spec or better(60mV for the 12v rail) will have no impact on CPU overclocking on a quality board.
Keep in mind, everything there generates heat, and while these components are designed to work in extreme conditions, they'll always work better while cool.. so it's good to always have some kind of airflow over the VRM/
3'rd Voltage regulation will have the largest impact on overclocking.. essentially, poor voltage stability will limit your CPU clocks and will push your voltages up to compensate for large oscillations, which in turn will generate more heat and all this gets compounded and leads to poor results.
I'm not gonna' theorize too much here so the simplest way I can explain this is as follows:
Linear loads are very rare, 99% of the time your CPU will jump from xA(A =Ampere) to xA +/- yA few times a second.. which means that while now it draws 60A @ 1.3v, in less then second it can go to half that.. and this working regime is the standard, is permanent.. and it's the VRMs job to keep that voltage stable while the current varies rapidly... and that's hard(there's a lot to talk about here and it's beside the point of this post, Inductance
would be your first clue if you want to learn more on this)... and that's why it's very important to deliver very stable voltages to the VRM in the first place, because what's happening between the VRM and the CPU itself also happens between the VRM and PSU, current varies rapidly and voltages naturally tend to vary with it.. so if you can keep them rock solid, the VRM will also have a much easier time doing that with the voltage it supplies to the CPU.
Now, a high end VRM can compensate for pretty bad voltage stability.. in fact a high end VRM coupled with an average PSU will land better results than your average VRM coupled with the best PSU on the market.
There's a lot of marketing nonsense here.. so you need to know what to look for... for example, seeing that 32 Phase Z77 board from Gigabyte made me chuckle a little knowing that there's currently no controller(that I know of) which can support more than 8 Phases, so marketing wise, they went far and beyond any vague trace of decency.
Where are you buying from(link the shop/s) and what is your PSU budget?