Often see some people do the calculation saying a certain PC take only 250W or 300W( ???W for CPU ???W for Mobo ???W for Video card etc ) so that a 350 PSU is enough
So, How to understand this by part?
So, How to understand this by part?
How to evaluate watt each component will take
- Thread starter YeJX
- Start date
Give this calculator a try:
http://www.extreme.outervision.com/index.jsp
The PC in my sig came up to 262 watts.
http://www.extreme.outervision.com/index.jsp
The PC in my sig came up to 262 watts.
This one looks well designed. They need to update the CPU and GPU offerings, though. The latest CPUs they list look like the old socket 754 ones. The Nvidia video card selections stop at the Geforce 4 series :shocked:
- May 13, 2003
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You know, I've honestly found the best thing to do is to e-mail the companies and request the information. I've found out all kindso f wonderful information regarding power use and requirements about my motherboard and other hardware via that method.
I got confused a little bit. When I set the PSU efficiency is 80% It suggest 374W while if it is 100%, then it suggest the PSU become 411W.
Why it become bigger? If its efficiency is high, I thought the the PSU should just cover the required power. while if the power efficiency is low, the PSU should need some redundancy so that the PSU should be bigger.
Why it become bigger? If its efficiency is high, I thought the the PSU should just cover the required power. while if the power efficiency is low, the PSU should need some redundancy so that the PSU should be bigger.
PSU efficiency refers to how much power it converts from the wall to usable power. For example: 350 Watt PSU with an 80% rating would use 437.5 Watts from the outlet to provide 350watts to the system.
- May 13, 2003
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Eff = Output / Input
So if your output has to same the same (IE you have a 450 watt PSU, and you are using say 250 watt), input (how much the PSU is drawing from the outlet in the wall) will change as necessary, which directly affects your effeciency (Eff).
Well, this does not explain my question. I am thinking, suppose my PC need 299W. if my PSU is a high efficiency one say 100%, then this PSU just need to be 300W because it is high efficiency.
well, if it is 80%, then it should be 375W. becuase 375*80%=300W>299W.
But now, what I have seen in the website is, if the PSU is low efficiency, then the Wattage is smaller, strange.
That's not the PSU efficiency rating, it looks like that number refers to how much of a load your pc is under (if its under 100% load, it's going to draw more power than at 80% load).
Then seems we still have to devide it by the PSU efficency. So, maybe if the website suggest 400W while the PSU efficency is 80% we might need to go for 500W
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It doesn't work like that. I understand what you are saying. If your hardware needs 295 watts, then that it what your power supply is going to output. The effeciency falls into how much power your PSU actually pulls to generate that 295 watts.
Your power supply is rated in output. The effeciency is the amount of power is pulls to generate that output compared to the output (IE the closer the numbers, the higher the effeciency).
I understand what you are saying the closer the numbers, the higher effeciency.
But I do not understand, why if we set a high effiecny, that website will suggest a high Wattage for the PSU
- May 13, 2003
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- May 13, 2003
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Okay, are you talking about the bottom, on the left. That is utilization... For example, I have my secondary PSU power mostly fans and lights, so the utilization is going to be higher than a drive powering mostly hard drives, as they aren't always in use. It's an estimation of sustained load vs peak load.
Okey, now I understand what is that untilization's meaning. Although, when they are not at high peak(obviously the hardware can not always work at peak), the recommend Wattage is 360W. If we think the efficiency of the PSU is 80%, so we actually need a 360/80%=450W PSU to be safely enough for the hardwared.
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Yep. And the efficency will determine how much power you pull from the wall to generate that power. 
Originally posted by: Fullmetal Chocobo
Yep. And the efficency will determine how much power you pull from the wall to generate that power.
Thanks, That make me feel that I should choose at least 500W PSU as 450 is just the edge when the efficiency of the PSU is 80%. Well, PSU like Antec SP2-45, the efficiency is a little bit below 80%, then it is enough for the hardware but it is a little bit dangerous.
Happy new year man
- May 13, 2003
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Originally posted by: YeJX
Originally posted by: Fullmetal Chocobo
Yep. And the efficency will determine how much power you pull from the wall to generate that power.
Thanks, That make me feel that I should choose at least 500W PSU as 450 is just the edge when the efficiency of the PSU is 80%. Well, PSU like Antec SP2-45, the efficiency is a little bit below 80%, then it is enough for the hardware but it is a little bit dangerous.
Happy new year man
Merry New Year. And it will be more merry when I get off of work. Good luck with the PSU.
- May 13, 2003
- 13,704
- 7
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- May 13, 2003
- 13,704
- 7
- 81
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