7850 vs 660 (in terms of recommended Wattage)

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Abhi Singh

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Mar 31, 2013
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mike69k
That is not how efficiency works. If the power supply is 500 watts at 85% efficiency, the 500 watts would be the 85%. It would pull about 590 watts from the wall to give you 500 watts. 90 watts would be lost as heat,etc. However, that power supply barely meets the requirements on the 12v, it is at 12x2. 12v is more important than wattage.

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mike69k

mike69k

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Sep 26, 2013
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That is not how efficiency works. If the power supply is 500 watts at 85% efficiency, the 500 watts would be the 85%. It would pull about 590 watts from the wall to give you 500 watts. 90 watts would be lost as heat,etc. However, that power supply barely meets the requirements on the 12v, it is at 12x2. 12v is more important than wattage.

 
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G

Guest

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7850 uses less power than 660.
I think theres no problem about the power. both are ok for your PSU,
Just find out which of the two cards has better performance.
 
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dz_designer

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Sep 29, 2013
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Mine is an almost 5 years old Gigabyte 420 Watts and it works perfect with an Fx-8120 and a Sapphire HD 7850 .. i don't know about your PSU but 500 watts sounds more then needed for me..
 
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mike69k

mike69k

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Sep 26, 2013
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The 660 needs 24A on the 12v, and the 7850 needs 22A on the 12v rail. This is MUCH more important than the wattage. He has 2 12v rails. He barely meets the requirements. He might have issues.

Don't listen to people who tell you the wattage is okay, and don't take into account the 12v. They do not know how power supplies work.
 
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Guest

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AMD or Nvidia, Both they always recommend minimum PSU wattage or greater not minimum amperes.
 
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mike69k

mike69k

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Sep 26, 2013
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Yes, they do. But, the 500watt rating is a maximum for a short sustained periods. If you are running a low grade power supply like his CM thunder you do not want to push it close to maximum for any length of time. When it comes to power supplies it is better to side with caution.

However I am looking all over the web and there seem to be different versions of this particular power supply. Can check the amps on the 12v. If it is more than 24A then you should be fine.
 
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A

Abhi Singh

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Mar 31, 2013
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details of the dc output of everything

Current at DC Output of +3.3 V 22 A
Current at DC Output of +5 V- 19 A
Current at DC Output of +V1 V 24 A
Current at DC Output of +V2 V 21 A
Current at DC Output of -12 V 0.3 A
Current at DC Output of +5 V sb 2.5 A

So its ok or not?
 
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Guest

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If you already have that PSU, It is still ok, But dont overclock GPU, CPU, etc.
 
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