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No video on nvidia physx dedicated multicard

I used to have a gtx 560 along with a physx dedicated gts250, was working fine.
Today I upgraded to a gtx 680, still wanting to use the gts250 for physx.
When I booted with both cards neither card would output. Computer would boot, no beeping or anything, just no output to video.
Then I removed the 250 and I got an output, gtx 680 works fine alone.
PSU calculators tell me 550W PSU should be all right, my PSU is 620W.
Checked 4 times all connections, would only work with one card.
Why would 2 cards setup work with 560 and not 680?
Setup:
i7 920
8Gb ram
Rampage gene 2 motherboard
8 answers Last reply Best Answer
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  1. Best answer
    Well, I would like to point out using that low of a GPU for PhysX will actually decrease your FPS, so it doesn't matter that it doesn't work :) Give me a minute and I'll see if I can bring you up the performance videos proving this.
  2. SlitWeaver said:
    Well, I would like to point out using that low of a GPU for PhysX will actually decrease your FPS, so it doesn't matter that it doesn't work :) Give me a minute and I'll see if I can bring you up the performance videos proving this.


    Interesting, I didnt do any exhaustive benchmark test, but I thought I noticed an increase on planetside when used with the gtx560. So do you think I should use the 560 for physx along with the gtx680? I guess I'd need a new PSU then.
  3. emileS said:
    So do you think I should use the 560 for physx along with the gtx680?

    Yes.
    emileS said:
    I guess I'd need a new PSU then.

    Yes.
    What do you think you can blow on a PSU? I have a few recommendations :D
  4. Either there's something wrong with the mobo or the power supply might be insufficient. Make sure the cards are connected to the psu. I had a similar problem like this before. I was told my power supply could be half dead due to long term usage. If you wanna save some power try unplugging the cd/dvd reader and other things that take up power.
  5. SlitWeaver said:
    emileS said:
    So do you think I should use the 560 for physx along with the gtx680?

    Yes.
    emileS said:
    I guess I'd need a new PSU then.

    Yes.
    What do you think you can blow on a PSU? I have a few recommendations :D


    I was thinking going with this: CORSAIR HX Series HX850 850W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply ... wouldnt wanna pay more then 300$
  6. emileS said:
    SlitWeaver said:
    emileS said:
    So do you think I should use the 560 for physx along with the gtx680?

    Yes.
    emileS said:
    I guess I'd need a new PSU then.

    Yes.
    What do you think you can blow on a PSU? I have a few recommendations :D


    I was thinking going with this: CORSAIR HX Series HX850 850W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply ... wouldnt wanna pay more then 300$


    I would get this PSU. But not from Newegg. Order it from Micro Center (they actually ship this product, search for store nearest to you) or from EVGA directly and it'll only cost you $110. EVGA is an incredible brand and I imagine you don't need more than 750W? Even with a 680 + 560? Maximum draw from those is 345W, and I doubt the rest of your system could even begin to use up the other 405W, so this is a pro choice! :D
  7. SlitWeaver said:
    emileS said:
    SlitWeaver said:
    emileS said:
    So do you think I should use the 560 for physx along with the gtx680?

    Yes.
    emileS said:
    I guess I'd need a new PSU then.

    Yes.
    What do you think you can blow on a PSU? I have a few recommendations :D


    I was thinking going with this: CORSAIR HX Series HX850 850W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply ... wouldnt wanna pay more then 300$


    I would get this PSU. But not from Newegg. Order it from Micro Center (they actually ship this product, search for store nearest to you) or from EVGA directly and it'll only cost you $110. EVGA is an incredible brand and I imagine you don't need more than 750W? Even with a 680 + 560? Maximum draw from those is 345W, and I doubt the rest of your system could even begin to use up the other 405W, so this is a pro choice! :D


    DANG. Should have waited for your reply. I actually just read it. I finally went with this, which now I realize is totally overkill. Ah well, dont matter. I finally tried gtx680 + physx ded gtx560 yesterday. PC worked all right with this setup, although when I tried to benchmark it with fluidmark, the 560 core temp shot up to 90 degrees, and was still rising as the benchmark test ended. Also its fan went crazy and started making this not so reassuring noise fans make when on override. Weird.
  8. 1050W is beyond overkill :lol: but hey, if you ever want to tri-SLI some Titans or something... ;)

    Also, take the 680 out of your system and put the 560 in the first slot on your mobo. Try running fluidmark then and see if the 560 still does the same thing.
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