# How do you tell when your power supply isn't big enough?

2766 Views 8 Replies 5 Participants Last post by  Nivz
Hi i was just wondering if there was some sort of monitor to check if your power supply is efficient, i've done a few small mods, mostly led fans led heatspreaders thanks alot.
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correct me if im wrong but doesnt mbm 5 monitor psu voltages

also post some pics of your psu mod cause im interested in doing some my self
Quote:
 Originally Posted by ThE_GeNeRaL correct me if im wrong but doesnt mbm 5 monitor psu voltages also post some pics of your psu mod cause im interested in doing some my self
LOL, u have mistaken me for someone who is smart. no i havn't modded the actual psu, just the rest of the case and stuff. mbm 5 does show voltages but i didn't know exactly what they were. there is one that says +12v , +5v, +3.3v cpu core and cpu I/O (+1.5V), so i am guessing that aslong as they are in the green i am olright?
Quote:
 Originally Posted by Nivz Hi i was just wondering if there was some sort of monitor to check if your power supply is efficient, i've done a few small mods, mostly led fans led heatspreaders thanks alot.
I give you props for manually adding the heatspreaders, as for firugin out if your PSU has enough output for your system you have to do the math, for each component on the system you have to multiply the Volts by the Amps to the the Wattage, when you get the wattage of each component jsut add them up and you get the total power consumption of your components.

V*A=W
sum of W on all components = total power consumption

I recommend doing as I do and having a PSU that gives an output of at least 50W greater than your current power consumption.

FYI:
If a device does not list the Amps it is uually a 1 Amp device.
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thanks alot guys, looks like i have some researching to do, finding out all the voltages of fans and lights and hardcano. thanks again.
Quote:
 Originally Posted by Nivz thanks alot guys, looks like i have some researching to do, finding out all the voltages of fans and lights and hardcano. thanks again.
Most of the case fans should be 12V*1A =12W.
After you get done with the research could you post the W of your devices on this post to inform others of the usage of those devices?
Quote:
 Originally Posted by Crash PSU Calculator http://www.adecy.com/psu/
Crash this PSU calculator is muvh better you should check it out
it has listings for all processors even if there core names [preshott,tbids]
also has the latest graphics cards listed.