680s flashed to 770 BIOS - Successes & Failures

Discussion in 'Videocards - NVIDIA GeForce' started by Caedo, Jul 18, 2013.

  1. Caedo

    Caedo Member

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    GPU:
    2x EVGA GTX 680 2GB
    Update: 28 AUG 13

    Courtesy of holystarlight, there is finally a 770 BIOS that lets my 680s function properly in SLI. This is the only 770 BIOS that I have tried that allows full SLI functionality with my 680s and still gives me Boost 2.0.



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    Hey guys.

    Quick background for context: I've got two EVGA reference GTX 680s. I used V3DT's online BIOS mod tool to open up the full 1.212V for both cards. One 680 took extremely well to it, OCing up to 1306 MHz core and 7204 MHz effective memory. The 2nd could not finish a single run of 3DMark, Heaven, or Valley at stock settings when given the full 1.212V.

    I found a working 770 BIOS (this one) from an OCN member. Flashed that to my misbehaving 680, and lo and behold, it's stable again. More to the point, it's stable when overclocked; it only reached 1280 MHz core (-26 MHz) and 7160 MHz memory (-44), but it got me a solid 100 point gain in Fire Strike.

    Proofs:

    EVGA GTX 680, 02G-P4-2680-KR, Core 1306 MHz, Mem 7204 MHz
    [​IMG]
    EVGA GTX 680, 02G-P4-2682-KR on custom 770 BIOS, Core 1280 MHz, Mem 7160 MHz
    [​IMG]

    Looked good, so I flashed my other 680 to the modded 770 BIOS. Lost 100 MHz memory, but it was otherwise stable. The trouble is, they wouldn't run together in SLI worth a damn. Unigine benchmarks crashed as often as not at "stock" clocks. 3DMark benchmarks wouldn't even load the first test. Call of Duty 4 flickered insanely, Tomb Raider crashed, etc. Just wouldn't work. Drop it to a single card, though, and life is good.

    Has anyone else played with 770 BIOS's with their 680s? Anyone able to get them to work in SLI?
     
    Last edited: Aug 28, 2013
  2. Caedo

    Caedo Member

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    GPU:
    2x EVGA GTX 680 2GB
    Tried again using the 770-mimic BIOS here (halfway down the first post). In this case, I left my 680s in SLI and used nvflash to flash them both at once. The card in the top slot (vanilla 680) flashed successfully. The card in the bottom slot (Superclocked 680) was dead in the water; took only minimal power, stayed at idle, and the fan did not spin at all. Flashed both cards back to stock.

    Did a 2nd time using the modified 770 BIOS listed in the OP with identical results. It was a little more stable on 320.18 than on 320.49 and could make repeated runs through Unigine benchmarks. Still failed to load into any 3DMark benchmark and crashed attempting to load into COD4 and Tomb Raider.

    The modded 770 BIOS seems to make my overclocks more stable at slightly reduced performance on the vanilla 680, and rock solid stable at higher performance on the Superclocked 680. I have no earthly idea what this means about what's going on under the hood. :3eyes:

    It might be emulating or enabling Boost 2.0 helps my stability as long as I can keep temps in line?
     
  3. ---TK---

    ---TK--- Ancient Guru

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    you can mod a 680 bios to 150 PT, 100% fan, 1.212v. I dont know if a 770 ftw 4gb card is coming out or not, thats the bios I am waiting for
     
  4. Caedo

    Caedo Member

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    GPU:
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    You can mod PT to 200%, actually.

    [​IMG]
     

  5. moab600

    moab600 Ancient Guru

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    My 680 is oced to 7100MHZ and 1230MHZ, any point update bios to 770? GPU Boost 2.0 sound nice, though i tried update my 680 to 770, but no success.
     
  6. Caedo

    Caedo Member

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    GPU:
    2x EVGA GTX 680 2GB
    On my vanilla 680, I lost 100 MHz memory and 2 FPS in Valley 1.0 on the 770 BIOS. On my Superclocked 680, I went from being unstable at stock with 1.212V to being stable and a great benchmarker, outscoring the vanilla 680 with lower clocks. Both of my cards got to higher core clocks than yours (1280 and 1306 MHz), and the same or better memory (7100-7200 MHz) on the unlocked 1.212V BIOS and the 770 BIOS.

    Is your 680 getting full 1.212V? I'd think it could hit a little higher core than that.

    Right now it seems very individual-card-dependent, though nobody has managed to get SLI working on the 770 BIOS.
     
    Last edited: Jul 20, 2013
  7. CronosX9x9X

    CronosX9x9X Master Guru

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    That's interesting what's the upside to having your 680's flashed to 770's bios via sli how much of a gain would you actually get?. I'm curious
     
  8. moab600

    moab600 Ancient Guru

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    tried to flash my reference GTX 680, no go. black screen after boot.
     
  9. ---TK---

    ---TK--- Ancient Guru

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    Try flashing an unlocked 680 bios?
     
  10. Caedo

    Caedo Member

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    On the BIOS I could get to work, I got more performance (higher 3DMark score) with one 680 clocked slightly lower than my other 680. On both 680s, I was more stable while at max clocks, though my vanilla 680 couldn't OC memory quite as high (could still do 7k).

    If you're running a single 680, it might be worth trying out. If you run SLI, then no-go.

    moab600, did you try the modified 770 BIOS I linked in my first post?
     

  11. ---TK---

    ---TK--- Ancient Guru

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    Is there evidence you cannot flash 2 680 to 2 770 in sli? If true I aint going to bother
     
  12. moab600

    moab600 Ancient Guru

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    Yes as well as some others, no luck at all. wonder what i doing wrong, since i familiar to flashing VGA bioses years...
     
  13. Klapcos

    Klapcos Active Member

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    Thanks Caedo for testing this, really appreciate it :)
    I wanted to test this myself but didn't want to risk it ya know. Well I'm going to stay with the stock bios for stable SLI performance @1320Mhz core & 7100Mhz memory.
     
  14. Caedo

    Caedo Member

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    I'm still searching for that optimal mix of performance. Something tells me the 770 BIOS flash will eventually be it, but until then I'm stuck on stock BIOS. Woe is me. :p
     
  15. CronosX9x9X

    CronosX9x9X Master Guru

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    You can't go wrong with 1320mMhz core and 7100Mhz memory I'd say your getting good performance til maxwell anyways. Nice OC by the way : )
     

  16. Bloodduty

    Bloodduty Master Guru

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    I keep it as simple as possible use the same bios it has and modify it

    [​IMG]

    so much easier then trying to make it something its not
     
  17. Loophole35

    Loophole35 Ancient Guru

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    ^Thats all well and good but people are trying to unlock boost 2.0 on their 680's it has little to do with the stock clocks of the 770.
     
  18. ---TK---

    ---TK--- Ancient Guru

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    true that I do not want to try a 770 bios for 680 clocks, I got that already. I do not think a 770 ftw 4gb is coming out tbh. I dont know if I want to try a different brand 770 4gb bios or even the 770 4gb classy. I want to give boost 2.0 a whirl well see though lol
     
  19. Fox2232

    Fox2232 Ancient Guru

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    Maybe someone with 2 real GTX770 may save bios from each card and compare them.
    They may have some unique serial ID which is used by driver to distinct each card in SLi.
    Having same serial ID may lead to cards working solo, but not in SLi.

    Other thing is if you look into driver inf file on libraries for GTX770 and GTX680, are they same? May be case that after both cards are flashed to GTX770 you need to reinstall drivers to have it all working as designed.

    You do not need to look for what's same here, but for things which are different between working GTX 770 SLi and not working GTX680>770 SLi.
     
  20. Bloodduty

    Bloodduty Master Guru

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    [​IMG]

    the top 3 are the 770 bios the bottom 3 are the 680.

    you can out perform the 770 if tweaked right.

    this is something I've done for years, another tip for users of SLI - edit each card with different memory clocks only has to be around 10 to 20 Mhz and gpu clocks you find no micro stutter, I found that out from years ago with 6800 ultra (used on 2 4780s 2 5870s GTX285) worth a try if you are comfortable with flashing.

    pity I did not have a 770 to hand, I would test that. Alls I can do is run a bench test, then put this up so you can compare with something like that.
     

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