Question based on POWER SUPPLY UNIT ! Plz help me out with this !

Ekjyot

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Jan 11, 2016
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hey guy i have got certain question regarding PSU
Plz help me, plz ?

Q1) what is 12v rail ? I mean what is it meant fir ? Were is it situated on psu ? Or is it not on psu ? Plz lemme know !
Q2) what is amls ? I mean it is like, "12v 30A" what is that ? I m really not good at psu stuff

PLZ GUYS HELP ME OUT ! :') THANK YOU !!!!!!!!
 
well, basic theory behind how power supply works:
the plug on the wall supplies electricity to PSU at 120V or 230V depending on what it is on your country.
Transformer inside turns that to 12V, however since it is still AC and not DC that computer wants, it goes through rectifier and a few more electronic components like regulator to get it to 12V DC(or 5V or 3.3V or any other voltage really)
Rail, is basically what sits behind single regulator and quality of components determine how much it can handle before it blows.
Since cheaper solutions are not as sturdy, most cheaper power supplies usually have more than one 12V rail with smaller maximum load and more expensive ones have less with higher maximum load.

In your case, 12V 30A is maximum load said rail can handle which would be bad news if you try to use graphics card that wants more like R9 390X or something like that.
if the PSU has multiple 12V rails with max of 30A each, you could possibly get around it, in theory, by making sure that each PCI-E power cable attached to GPU comes from different 12V rail, thus splitting the load between them.
That doesn't mean I recommend it though but that is all what it basically means.

So.. Rail is the end point of PSU, where the cables that go to your computer are attached to. 12V rail supplies 12V DC and 3.3V rail supplies that and 5V rail supplies that.
maximum load, 12V 30A is what said rail can supply before it goes over it's capacity and will more or less likely blow. (yes, physically) so if planning on adding extra things to computer, making sure the power supply can handle it is important.