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PSU problem; watts

post #1 of 4
Thread Starter 
in the pc market we have PSUs ranging 250-600w. maybe more.

but are those numbers (ie 400w) show how much power they produce (Output) in 5 and 12v DC?
OR
is it the power that they use (input) from 120v or 230v AC ??

So if we calculate system wattage (by online website calculater) how to buy the suitable PSU??
post #2 of 4
The number quoted is the maximum amount of power that they can produce in something like a 30 second burst. Their actual usage is somewhere about 60-70% of that number.

When buying a PSU it is more important to look at the amperage supplied on the 12v line. A good PSU will have somewhere in the range of 27 amps and up.
Elite
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IBM PPC Triple core @ 3.2GHz Custom ATi Xenos 10MB 
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Elite
(13 items)
 
  
CPUMotherboardGraphicsRAM
IBM PPC Triple core @ 3.2GHz Custom ATi Xenos 10MB 
Hard DriveOptical DriveOSMonitor
120GB DVD ROM XBox 360 Dashboard Dell 24" 2405FPW 
PowerCase
Big Honkin One Black 
  hide details  
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post #3 of 4
Quote:
Originally Posted by buddhika
in the pc market we have PSUs ranging 250-600w. maybe more.

but are those numbers (ie 400w) show how much power they produce (Output) in 5 and 12v DC?
OR
is it the power that they use (input) from 120v or 230v AC ??

So if we calculate system wattage (by online website calculater) how to buy the suitable PSU??
Hi Buddhika,

Geez, I hope I did not add to your problems of trying to figure out the right power supply. I think I was the one who added the link to the web site calculator in your last post here. I'm sorry if I did. Here's a link to Tom's Hardware Guide and some testing they did on power supplies. Perhaps this will answer some of your questions.
http://www.tomshardware.com/2005/07/11/stress_test/

I know some on the web and perhaps here in this forum do not think highly of Tom and his bunch, but they are one of many good web sites to get information from. All decisions are still yours to make on what to purchase or do, but an informed decision will be a good one!

I hope this helped, :-)
post #4 of 4
Thread Starter 
but thawnks buick for posting that web calculate power.

thanks for everyone for replying.
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