Finding a power supply that can best suit my desktop and new graphics card

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TheFung

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Jun 25, 2013
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Hey,
I'm purchasing a Sapphire HD Radeon 7850 2GB for my regular desktop. My current desktop is currently running on a 350W power supply with an integrated ATI HD Radeon 3000 graphics card on an AMD Phenom II X4 955 processor. It also is running 16GB of RAM, 2TB of HDD memory, one DVD/CD combo drive, and one media card reader. How much watts do I need to run this graphics card and what should I look for in a power supply?.
Thanks.
 
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The Kasafist

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Mar 20, 2013
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Should not need more than Probably just simply 450W just to give it a bit more cushion assuming you don't plan to crossfire it. You should focus more on its efficiency so it's not juicing power like gold or platinum certified. Perhaps a fanless Seasonic I hear those are pretty darn amazing!
 
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TheFung

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Jun 25, 2013
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I just read that the AMD HD Radeon 7850 recommends a 500W (or greater) power supply with one 75W 6-pin PCI Express power connector. I'm looking on newegg for a power supply with a 75W 6-pin PCI Express power connector and I can't find one that says they have one? Could you help me?
 
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ko888

ko888

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Feb 18, 2009
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For a system using a single AMD reference design Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 27 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

Select from brands like Antec, Enermax, PC Power & Cooling, Seasonic, XFX.
 
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TheFung

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Jun 25, 2013
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How do I find out what is sufficient for my system? Do I based my new power supply on my old one? Also, I do not plan on overclocking anytime soon.
 
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ko888

ko888

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What is the form factor of your old power supply? Provide the physical dimensions. If it's an ATX PS/2 PSU form factor then that is the most common and easiest to buy. If it's a micro-ATX or mini-ITX or SFX or TFX form factor then it will be more difficult to find. Custom form factor PSUs with higher power rating would be near impossible to find.

If you won't be overclocking then a 450 Watt or greater system power supply with a maximum combined +12 Volt continuous current rating of 27 Amps or greater and with at least one 6-pin PCI Express supplementary power connector is all you will need.
 
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TheFung

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Jun 25, 2013
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I believe I have an ATX Mid-Size Tower.



I'm in the US. My budget for a PSU would be $100 but I can go over.
 
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Dark Lord of Tech

Dark Lord of Tech

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Aug 18, 2009
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http://us.ncix.com/products/?sku=59615

XFX 550W PRO550W Core Edition Single Rail ATX 12V 44A 24PIN ATX Power Supply 80PLUS Bronze


Our Price: $55.99 USD
Savings Code 59615-1065. SAVE $14.00 off our regular price of $69.99 if you buy today! Special price ends 06/26/2013.
After Mail In Rebate: $45.99 USD
 
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The Kasafist

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I've seen Blackbird give advice before he's really good I would snatch that!
 
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TheFung

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Jun 25, 2013
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Oh, I just discovered that my current PSU is 80mm x 150mm x 140mm (width x height x depth) and that my case looks like it will only accept PSUs with that specific size. Which PSU will fit?
 
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ko888

ko888

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Feb 18, 2009
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From the ATX12V Power Supply Design Guide:

ATX PS/2 PSU Form Factor Physical Dimensions:

150mm W x 86mm H x 140mm D

or

5.9"W x 3.4"H x 5.5"D

The depth dimension of the PSU is allowed to be larger and still be considered an ATX PS/2 Form Factor PSU.

Measure the height of the PSU bay in your computer case. If you can provide the brand and model of the computer case, please post it. If it's a consumer desktop PC like an Acer, Compaq, Dell, Gateway, HP, etc, then please post its brand and model number.
 
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