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PC won't start with two Graphic Cards

post #1 of 6
Thread Starter 
I had a GTX 460 laying around so I figured I would put it in my PC and use it for my secondary monitors while my 780 handles my primary monitor. My PC won't start with both Graphics cards connected however, it only flashes some of the led and nothing else. Both GPUs work independently if I unplugg the power cords to the other (although the 460 doesn't seem to send out any signals to my monitors...)

Using molex connectors as my PSU doesn't have enough 8/6-pins for two graphic cards.

Graphics cards: GTX 460 & GTX 780
PSU: Fractal Design Tesla 650w
Mobo: GA-990FXA-UD3 (rev. 1.2)

Should have plenty of power left, even with 2 graphics cards. I have also turned off what little OCing I was doing.

Edit: "obvious" suggestions are very welcome. I haven't tried using two graphics cards before so I probably just forgot something essential.
Edited by MrShootHappy - 4/26/14 at 6:04am
post #2 of 6
That PSU might not be up for the job.
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X79-GCN
(22 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
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Logitech G400s Senn HD 598 
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by BradleyW View Post

That PSU might not be up for the job.

Should be enough. I checked with the first best powercalc I could find and I should have 100w "left over"
post #4 of 6
Those two cards wont SLI. You need the same chip set as the 780 for the two to run in compatibility mode.

http://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=1709

Try this.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by Indiegreg View Post

Those two cards wont SLI. You need the same chip set as the 780 for the two to run in compatibility mode.

http://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=1709

Try this.

I'm not running them in SLI. I'm using them independently for different monitors.
I don't really understand what's going on in the link but it doesn't seem to be relevant to my problems.
post #6 of 6
they 780 needs 42a on the 12v rail the 460 need 26a on the 12v rail your psu has a 54a on the 12v rail so you probably will end up with some issues if both cards are at full load

are you sure your 460 actually works have you tried powering it by itself with out the adapters if your not getting any signal its probably a bad card?
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