Need help with picking a power supply.

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Gregz777

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Dec 27, 2013
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Here's the situation. I bought a GTX 780 ti, it requires at least 600 watts power supply to run.

I have found out too late that my current power supply only runs at 405 watts.

I need to find a power supply of at least 600 watts that can run my new card.

I have also heard that I need 2x 8 pin slots on it, as the graphics card comes with 2x 8 pin cables.

What do I do? I am absolutely stuck.

My pc specs are:

CPU: Intel Core i7 2600 @ 3.40GHz

Motherboard: Foxconn H61MXL/H61MXL-K

8 GB of ram.

That's pretty much it. Please help.
 
Solution
toyftw


Hi - I gave you that info above, including what the +12v amps are for, the link, what info is contained, etc.
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ko888

ko888

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Feb 18, 2009
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For a system using a single GeForce GTX 780 Ti graphics card NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 42 Amps or greater and that has at least one 6-pin and one 8-pin PCI Express supplementary power connectors. There are some non-reference design cards that require two 8-pin PCI Express supplementary power connectors.

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.

Seasonic G Series G-550 (SSR-550RM Active PFC F3)
• maximum combined +12 Volt continuous current rating of 45 Amps
• two (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS GOLD Efficiency Certification
• 5 Year Limited Warranty
• Link: http://www.amazon.com/dp/B00918MEZG/?tag=pcpapi-20

Corsair HX Series HX650 (SKU# 75-001217 / CP-9020030)
• OEM: Seasonic
• maximum combined +12 Volt continuous current rating of 54 Amps
• two (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS GOLD Efficiency Certification
• 7 Year Limited Warranty
• Link: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012

XFX Pro Series 650W Modular Edition (Bronze) (P1-650X-XXB9)
• OEM: Seasonic
• maximum combined +12 Volt continuous current rating of 53 Amps
• four (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty if registered with XFX within 30 days of purchase
• Link: http://www.superbiiz.com/detail.php?name=XFX-650XX&c=CJ
 
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Gregz777

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These numbers and letters confuse me as I am very unfamiliar when it comes to any computer knowledge.

I know my card will come with 2 x 6 pin and 2 x 8 pin connectors. I don't know how to specify what power supply would work best with different types of plugs etc etc.

I really need a simplified version of what is being said to me.


 
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enemy1g

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Get one of the aforementioned suggestest PSUs. They will come with 2+6 (8 pin) connectors. They come as 2+6 pin so that you can use them as 6 pin, or 8 pin connectors. You don't have to worry about the connectors that come with the GPU.
 
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Gregz777

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I assume this means I can just use the 6 pin and 8 pin cables that will come with the graphics card, and taking your advice of "You won't have to worry about the cables that come with the GPU"(power supply) means I can just completely ignore those cables?

I suppose fitting will be rather simple to understand and execute as well?

 
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toyftw

toyftw

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Jul 29, 2012
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Hi - A lot simpler than you realize. The 780ti requires 1 6pin and 1 8pin(6+2), each of the Corsair, Seasonic, and XFX units listed above have at least the two required (the XFX650 has more than you need). You won't need to use or adapt any PCIE cables that may come with the GPU. If you have a non ref 780ti that requires 2 8pin pcie connectors, then choose the XFX650 PSU, as it should be less expensive.

 
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Gregz777

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Alright, so in short, all the cables I need will come with the graphics card anyway, and the X650 will be compatible with such cables?

Thank you for the answers given so far by the way guys. I only persist with questions as I want to make absolutely sure this transaction goes without fault.

So, the X650 it is? Is this a good idea? And is anything else lower than 80+ Gold a bad choice?
 
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toyftw

toyftw

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Hi again - in short the PSU will have the pcie cables you need, you should use them, they are designed for
port receptacle in the PSU. Cables included with the GPU are likely to be adapters.

Yes, the XFX650 is a good choice. Plenty of +12v amps.
There are a lot of PSU's below gold that are good and bad. Each PSU model has to be evaluated on it's own merits.
 
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toyftw

toyftw

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Hi - Please go to link below - It is up dated daily. It lists most but not all brands of PSU's. Go to the brand
you are interested in, then scroll down to the model # of the PSU you are researching.

It'll list a lot of pertinent info, such as OEM, efficiency and Haswell compatibility, power rating & at what temp, how many pcie connectors, and combined +12v amps/watts. If the +12v valu is expressed in watts divide by 12 to get the amps.

Off to the right will be lab reviews if any. try to find a review from Hardware Secrets, jonnyguru, or Hardocp.


http://www.realhardtechx.com/index_archivos/Page541.htm

+12v amps is the power available on the +12v rail(s). Your most power hungry components such as the CPU & GPU
draw their current from the +12v rail(s). So, it is a much more relavent spec than total power rating.
 
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Gregz777

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What does "42 amps" "ON" the 12v rails mean? Where would I find this information when looking at the many choices of power supply? How can I find out the power supply I'm looking at has what I need?

 
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toyftw

toyftw

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Jul 29, 2012
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Hi - I gave you that info above, including what the +12v amps are for, the link, what info is contained, etc.
 
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