Understanding the Power Supply

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Guest

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I have a problem with chosing the right power supply. Here's the list of my optional PC components:

1f0e5edb79777b725f93f68732a3ed9e.png


And the electricity demand :

3cfa1fc3aebc226a0f1728886423fb5d.png


Ok, right. 457W. Not bad. But then I checked the electricty demand on http://www.enermax.outervision.com and add some overclock and components...:

be78411b78b0da6aae4d8a446bfe9d83.png


Whaaaaat ? 710W ?! What i am doing wrong ? Please help.
 
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Doramius

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Mar 24, 2013
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Looks like you've added to HDDs, and DVD burner, a Tuner card, 2 other cards (it says to exclude the selected video card for PCI slots used) in the 2nd graphic. That'll definitely bump up your output wattage. Whatever you get for a final number, add 10-20% to the number, to find the appropriate PSU. IE: A 750W calculation would best use a 900W or larger PSU.

Verify all your components, and make sure you're not doubling up or missing anything in your calculator.
 
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Guest

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Thank you for anwsers. I changed a few components :

69f3ebf355b3179a48a2ca4a639bf12c.png


And now its 697W at 100% system load. I have to ad to this 20% of power ? I find a nice 700W PSU, but i dont know, if this power will be enough for it.
I will also do overclocking to i7 4700K.
 
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toyftw

toyftw

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Jul 29, 2012
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Hi - 1st, Blackbird is right online PSU calcs way overestimate. 2nd - the Partpicker tot of 457 is far more accurate
than the other (I'll explain in a min). And that is if all are running at full which is unlikely. The fans, SSD, & RAM are not going to draw the high side listed. The hdd's might not as well. Assume the CPU & GPU will draw max.

On the Enermax calc - You are showing 3hdds, 2 high rpm & 1 sata, but you config lists only 2 and thes are not
high rpm models. You are also showing a DVD drive and a Blu ray drive, but partpicker shows 1 drive only.
You are also showing 8 USB devices drawing power from the system, I don't think that's what you are really drawing.

In any event, a 650 is not only plenty for your system, a good 550w unit will run it. Personally, I'd go for the 650 as you have a CPU & GPU that will both likely be OC'd.
 
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Guest

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But i am a little be confused. I was looking at the charts etc. and.... there are a lot of expensive PSU's. Is that model wich I find will be stable ? Maybe invest ion more expensive PSU...?
 
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Doramius

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To say wattage calculators are inaccurate is not a completely true statement. They are based off of the manufacturer's specs, and list info at a components highest usage. The are required to use the highest number for liability reasons. You cannot fully use the number given, but you cannot discount it either. Yes, you should add 10-20% to the listed number. This gives you coverage for 'peaking', upgrades, future added components, and reliability.

a 700W PSU would adequately power you build, and you may never experience any issues with it. My personal preference would be a 650W minimum, from the hardware information you've provided.

IE: total = 697+70(the 10%)=757 which is roughly a 750W PSU
 
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Guest

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Ok... i have :

Intel Core i7 4770K
ASrock Extreme 4
Asus DVD+/-RW DRW-24F1ST/BLK/B/A bulk black (Serial ATA)
Compro VideoMate Vista E800F
WD Blue 1TB 64MB 7200rpm SATA/600
WD WD1003FZEX 1TB WD Black 7200 64MB SATA III
GEIL DDR3 16 GB 1866MHZ DUAL EVO VELOCE CL9
Crucial 256GB MX100
SilentiumPC Gladius X60 Pure Black (case)

I wanna buy GeForce GTX 770 and Noctua NH-D14.

The RAM's, CPU and GPU will be overclocked.

Now concidering about what SR-71 Blackbird said, i mean the EVGA SuperNOVA 750 G2 Power Supply. I asked again, is that model will handle my PC and if it will be stable PSU ?
 
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