What is the purpose of increasing the voltage of a video card or a CPU?

[EmmChio]

Hello, good evening to all again.

I'm telling you... I have a Zotac GTS 450 DDR5 1GB GPU Fermi 106, whose values are as follows:

CURRENT OC: GPU CLOCK 920 MHZ - MEMORY 1150 MHZ - SHADER 1840MHZ
ZOTAC Normal: GPU CLOCK 875 MHZ - MEMORY 1000 MHZ - SHADER 1750MHZ
Gforce Normal: GPU CLOCK 783 MHZ - MEMORY 902 MHZ - SHADER 1566MHZ

I do a stability test with a program called TESSMARK 0.3.0, I do it at various levels, normal, extreme, insane, etc., and when I run the test graphic it doesn't degrade, nor distort, nor does it get strange lines that show that the OC is starting to fail or reaching its limit. Like all graphics cards, they have a level of voltage set and, in a way, LOCKED, I have used several programs that I will recommend: NVIDA INSPECTOR 1.9.5, NIBITOR 6.0.6, etc. The nvida inspector is similar to gpuz only that it allows you to increase voltage (the general one I don't know how to call it) which by default on my card comes in at 1.100V, and the NIBITOR allows you to modify some values of cpu fan, speed etc....

Now, reading in this forum and others, they explain that sometimes or almost always to increase the speed of a cpu and in my case and what the topic is about, increasing the speeds of the gpu clock, memory etc., you need to increase the voltage because at higher speed it consumes more voltage and if it doesn't have an adequate voltage, the OC can be very short and doesn't support much OC.....my question, IS IT TRUE? My card comes from the factory with a voltage of 1.1625, and I have raised it to 1.2... mind you, the card allows it, now my other question is: What happens if I put this value to 1.2, does it allow me to do a greater OC to my video card? I have an 800W power supply...

Another thing that catches my attention about this graphics card, is that I read in a forum, which by the way you have to subscribe with 1$ to be able to comment and post in forums :S, that this graphics card can edit its bios, and take the speed of the gpu to 980 MHZ (therefore 1960 MHZ of shader) without any problem, but I only achieve the maximum value that I put above.... Another thing, even though I raised the voltage of my card to the limit to 1.212 V (default 1.1625), and the voltage of the 3d performance graphics I put it at 1.0125V (default 1v minimum) and at maximum 1.2V (default 1.375V) and still programs like GPUZ and GPU SHART show me that the VDDC max is 1.100V even when playing heavy games :S, to reach the limit I have to apply the NVIDIEA INSPECTOR program that allows me to increase the voltage and increase it manually :(....

Well that was my doubt for the moment.

Thank you very much dear forum members. Success.