(03-07-2014, 03:08 PM)Asmodean Wrote: What about the electrical efficiency. Most power units runs with best "electrical efficiency" when having a workload of 70 to 80 percent.
Your vendor should be able to tell you the specs of your power unit.
So you have to look over the electrical loads and sum up the consumption.
(video card, cpu,...) The total cunsumption should be the same amount as 70/80 percent of the power unit output.
If your system has at a max workload a consumption off e.g. 300 watt (which is realistic looking at your components) with an powerunit which has 80 percent electrical efficency, the total consumption will be 375 watt. (300/0,8=375)
You got that part completely backwards. Actually, if you measure 300W "power consumption" at the wall and your PSU has an efficiency of 80%, it means that 80% of the 300W (240W) is used by the hardware while the remaining 20% (60W) are heat.
Yes, I was calculating backwards. 300 watt theoretical output to 375 watt to the wall using the coefficent. I did some static number joggling only. Its just to get an rough idea, which power unit you need.
Also my calculation is concentrating on a stressed system.
Its just important, if youre playing hardware stressing games often, that your power unit ist not running at 100 percent workload. Thats why I do a little math, before i buy power unit.
Just buy a powerunit between 400 watt und 500 watt and you will be happy.
