Will this power supply work with the GTX 780 Lightning Edition?

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toyftw


Yes, way more than enough. Max +12v (combined) amps is 68+. They actually list it as having
five +12v rails, which probably isn't true, but still more than enough +12v amps for rig, then some.

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toyftw

toyftw

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Jul 29, 2012
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Yes, way more than enough. Max +12v (combined) amps is 68+. They actually list it as having
five +12v rails, which probably isn't true, but still more than enough +12v amps for rig, then some.

 
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Solution
toyftw

toyftw

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Jul 29, 2012
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Hi again - not necessarily. Could be a myriad of things; What brand/model is the GPU?
Could still be the PSU, (faulty, overstated specs, etc)
Could be bad cable (has happened to me twice over the years)
Could be short in mobo, bad ram stick.

If you have onboard video (mobo or CPU) try connecting the monitor to it. If you get image, then
you at least eliminate the PSU and cable.

Please be sure you are using two pcie connectors and not one with dual connecting pins.

If you can eliminate any of the above, then if you had a friend or access to another PC, you
could narrow it further.
 
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Cody Sanders

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Jun 16, 2015
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The system makes it to the windows 7 boot chime; however, I get no display-- not even the POST screen. My AMD Radeon HD 7850 displays without a problem and so does the onboard.
 
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Cody Sanders

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Jun 16, 2015
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The onboard video works fine, even if the two PCI-e connectors are plugged into the GPU. I can have the GPU in the PCI-e slot with both power connectors inserted, but I still get a displayed image from the motherboard. Also, like I mentioned before the GPU will not display, but I hear the Windows 7 boot chime.

 
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toyftw

toyftw

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Jul 29, 2012
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Hi - Onboard video works, so the PSU and video cable connecting onboard video to monitor are
OK. Altho, it's still possible the PSU (rails supporting pcie connectors) is faulty/insufficient for the 780.
So, it looks like the culprit is either the GPU (most likely) or the PCIE slot on the mobo is defective,
but that is unlikely as I assume it's the same slot you use for the 7850.

If I remember correctly that PSU has 4 pcie connectors, if so try the other two. No single +12v rail
on that PSU is rated over 18a, so it's important that the pcie connectors are on diff rails (your mobo
manual should show schematic/layout) and neither should be on the same rail as the CPU.

So, try changing those up, if any of the pcie's are on the same rail or share with the CPU it won't disply.
It looks like a bad GPU, but is there another PC to try it in?
Or is there another PSU (with at least 2 pcie connectors) you can borrow to try in your sys.?

Remember, if it turns out to be the PSU, it's not the total power that's the issue. A good quality modern
design 550w (650 for heavy gaming/OC) is enough to power a sys with a gtx 780.
 
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