How many amps does my PSU have ?

Page 2 - Seeking answers? Join the Tom's Hardware community: where nearly two million members share solutions and discuss the latest tech.

Dzenan Aljukic

Reputable
Aug 13, 2015
55
0
4,630
So my question is simple ?
On my PSU stands
Load Min Max
+3.3V 0.3A 24A
+5V 1.0A 30A
+12V1 0.5A 19A
+12V2 0.5A 20A
-12V 0A 0.6A
+5VSB 0A 2.0A

Max power=550W
Super-Flower

I need to know how many amps do I have since I have a GTX 580, that requires 42A and 600W minimum power to run it.
My graphics card wont even turn the monitor only the fan is working. Sometimes I even can't turn on the PC from the first try, is my graphics card wasting too much power ? Do I need a new PSU and which one ? (HOW MANY AMPS AND HOW I CAN KNOW HOW MANY AMPS THERE ARE)
 
Solution


Multirail PSUs are much safer than single-rail PSUs and cost more money due to better protection ICs and more shunts. It's scary that there are 750W, 1000W, and even 1600W single-rail PSUs out there. Short circuit protection only detects low resistance shorts, but a high resistance short will cause a resistance and cause an overload. Current will jack up and in many single-rail units you'll be left with molten plastic and copper at the bottom of your computer case whereas a multirail unit will have prevented it...
When you start your computer nothing is under load it shouldn't be using more than 60W. I told you repeatedly the PS has nothing to do with this but you won't answer my question I asked above.

Somehow this thread turned into power supply talk. So what was your initial problem again? You turn on a computer, and is everything running? It remains on, fans all running, right? But your monitor gets no signal, right? First off what are your completely full specs?
 

It takes 220W to equal 20amps so your 420W 12v is pusing about 37~38amps. Its a bit less than the 42amp requirement of the 580. Now new it could possible power the card for a while under great strain.
 
If you say that nothing is under load, why is my computer failing to start from the first time when i put my card in. The fans begin to rotate and suddenly stop like someone turned the power completely off. Then I try it 1-2 more times and its working. When I take the GPU out it starts normaly.
 

You already have the answer to this question from multiple replies in this thread. It's likely your GPU is toast, in which case how much power a GTX 580 would draw and how much your PSU could provide are irrelevant.