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 Post subject: Best Power Supply Calculator for a New Build
PostPosted: Sun Apr 21, 2013 12:19 pm 
Klamath
Klamath
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Joined: Mon Apr 17, 2006 4:33 pm
Posts: 345
Location: Prince Edward Island, Canada
I am in the process of building a new system, but am at a bit of a loss for what I need for a power supply.

The specs are as follows:
- Gigabyte 78LMT-USB3 AMD760G mATX AM3+ Mobo.
- AMD Bulldozer FX-8120 8 Core Processor 3.1GHZ Socket AM3+ 125W Retail Box
- A Samsung 840 Series 120GB 2.5in SATA3 MDX Solid State Disk Flash Drive SSD
- Two WD 320 Gig Sata drives from my old system.
- Kingston HyperX Blu Red KHX16C9B1RK2/8X 8GB 2X4GB DDR3-1600 CL9 DIMM Non-ECC Dual Channel
- A Sony DVD RW drive
- A Cooler Master Elite 350 Black ATX Mid Tower Case with a 500 watt power supply.

My problem is trying to figure out id the power supply/case combo I selected is sufficient. According to the on-line calculators I have used so far, they state I will need anything from a 350 to a 900 watt unit.... hence my confusion.

Suggestions anyone?


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 Post subject: Re: Best Power Supply Calculator for a New Build
PostPosted: Sun Apr 21, 2013 12:40 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5244
http://extreme.outervision.com/psucalculatorlite.jsp This is the only one you need.

Games don't actually tax the system to its fullest. My last reading off the socket was actually lower than the lowest estimate I could get from this... Which isn't a bad thing. But to help...

  • Put everything in there. At the bottom right, adjust for 100% load and 10% capacitor aging.
  • Round up to the nearest 50W. Then get a power supply that's 50W-100W higher than that

So for instance, if you have power requirements at 423W and 483W, these would convert to 450W and 500W after rounding, then you would get something that was between 500W-550W and 550W-600W respectively.

Power supplies are most efficient around 50%-60% load and considering that every time I measured it and tried to tax the system under the most stressful, nominal load (that's not a burn in test, as that isn't a typical usage case) is often around 50%-60% of what that calculator estimates... that's about as good as you'll get.

This also gives you room to upgrade, but normally most video cards and CPUs don't chew more power with subsequent generations.


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 Post subject: Re: Best Power Supply Calculator for a New Build
PostPosted: Sun Apr 21, 2013 12:50 pm 
Klamath
Klamath
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Joined: Mon Apr 17, 2006 4:33 pm
Posts: 345
Location: Prince Edward Island, Canada
Thanks for the advice! Very much appreciated!

Using the site that you provided I get a recommendation of 319 watts. So the 500 watt unit should just do the job.


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 Post subject: Re: Best Power Supply Calculator for a New Build
PostPosted: Sun Apr 21, 2013 1:57 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5244
I should add a caveat. Pay attention to the 12V rail and how much current it provides.


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