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Thread: DFI-SLi killing eVGA 6800U's?

  1. #1
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    DFI-SLi killing eVGA 6800U's?

    Hello Everyone, having experienced sudden death on my secondary eVGA 6800U on the DFi-SLI-DR board, and knowing of at least 3 other local benchers with the same issues, I posted a thread over at dfi-street.com, but as yet none of the DFI people have answered - see here: http://www.dfi-street.com/forum/showthread.php?t=18416

    Check it out, please, and let me know if you guys have experienced something similar. At least on my system, and another one, they were running default speeds when this happened, both FX55 rigs, with eVGA 6800U's in SLi config, 6693 drivers.
    Your feedback would be appreciated!

    Here is an excerp from the post:

    Hello DFI,
    I am seeing a disturbing trend with the Sudden Death Syndrome of the "Slave" card, specifically 6800Ultra eVGA in SLI config, on the DFI-SLi mobo. 3 Cases involved 6800U eVGA's, one case XFX 7800GTX.

    Under normal running conditions, no overclocking, and proper watercooling, myself, and 3 other Locals (South Africa) have lost the secondary card on our very similar DFI-SLi/eVGA 6800U rigs.

    In nearly all the cases, a small hexfet on the hsf-side of the GFX card popped, close to the edge of the pcb in the back center. Under normal running conditions, these hexfets stay very cool, and myself being an Electronics Engineer, is quite mistified by this behaviour.

    My setup is:
    DFI SLI mobo
    FX55 Clawhammer
    2x eVGA 6800U cards
    2x Mushkin 256 Black Level2 BH5 modules
    Enermax 600W 24Pin psu
    2x WD Raptor Harddrives
    HP Lightscribe DVD

    Cooling is via Maze4 GPU blocks (2x), Frozen CPU copper mem sinks, Modified Antarctica (to 1/2") cpu block, Coolwave 3x 120mm radiator, and Eheim 1260/DD5 Laing. No heat issues.

    One thing that I did, was to measure all PSU voltage rails with an Oscilloscope, and they are consistently flat, ripple well within specs. As it should be on a non-overclocked stock running setup.

    Under similar circumstances, default clocks, we lost in total 4 6800U cards in the 2nd PCI-eX xlot.

    Is their a possible issue we should be aware off, can you have a chat to Oscar concerning this? My thinking is thermal runaway in a vreg circuit, but yeah, it is pure conjecture, but it is suspect that we should loose secondary GFX card, under the same conditions?

    All of us used different memory brands, different PSU's, Enermax600W, OCZ 600W, Thermaltake680W, Mushkin BH5, Mushkin TCCD, Kingston HyperX, and decent cooling.

    Would like some feedback, please?

    Kind regards,
    MrBean.
    Never argue with Idiots...they will drag you down to their level and beat you with experience!
    i-Prodigy (small APD2 GFX/CPU waterloop) ; HP Blackbird Project Log (dual-Xeon Watercooled) ; Macho Mini Project Log (Sandybridge watercooled mini-ITX)

  2. #2
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    Did you guys buy the 6800Us from the same store/batch?
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  3. #3
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    Yes,
    But problem is the one guy who lost a 6800U, also lost now 2 7800GTX's, XFX7800GTX to be precise, this time the Marvel chip on the mobo popped, and secondary 7800 dead, Master showing garbage charaters on the screen. Like a corrupt bios, or maybe blown mem vreg on the gfx card.
    Never argue with Idiots...they will drag you down to their level and beat you with experience!
    i-Prodigy (small APD2 GFX/CPU waterloop) ; HP Blackbird Project Log (dual-Xeon Watercooled) ; Macho Mini Project Log (Sandybridge watercooled mini-ITX)

  4. #4
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    I have som problems with my DFI card, if i set my 7800 gtx cards in SLi the DFI card die,have lost 3 DFI cards now :-(
    Last edited by snekker`n; 08-07-2005 at 04:33 PM.
    A64 3700+. 2 x 512 OCZ VX.
    POV 7800 GTX

    3D05: 13809. 3D 2003: 31366. 3D01:36755

  5. #5
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    dfi boards are nothing but trouble <---

    Iwill P4r533-n_Intel 2.0A_512 PC800_Ati 9000p_Maxtor 60GIG_Generic PSU

  6. #6
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    Yes, i think i`ll go for Asus next time
    A64 3700+. 2 x 512 OCZ VX.
    POV 7800 GTX

    3D05: 13809. 3D 2003: 31366. 3D01:36755

  7. #7
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    Considering the video cards are powered directly from the power supplies and not the mb I would check there, the video card is only interfacing with the mb via the pci-e bus.
    Work Rig: Asus x58 P6T Deluxe, i7 950 24x166 1.275v, BIX2/GTZ/D5
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    Game Rig: Asus x58 P6T, i7 970 24x160 1.2v HT on, TRUE120
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    AMD Rig: Biostar TA790GX A2+, x4 940 16x200, stock hsf
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  8. #8
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    Well i have not this problems with the same video cards on a Asus mb and the same power supplie ( OCZ 520W)
    A64 3700+. 2 x 512 OCZ VX.
    POV 7800 GTX

    3D05: 13809. 3D 2003: 31366. 3D01:36755

  9. #9
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    I couldn't tell you what is causing the problem but the video card has its own voltage regulation which is supplied directly from the power supply, from what you are explaining the ps would be my first guess as the killer.
    Work Rig: Asus x58 P6T Deluxe, i7 950 24x166 1.275v, BIX2/GTZ/D5
    3x2048 GSkill pi Black DDR3 1600, Quadro 600
    PCPower & Cooling Silencer 750, CM Stacker 810

    Game Rig: Asus x58 P6T, i7 970 24x160 1.2v HT on, TRUE120
    3x4096 GSkill DDR3 1600, PNY 660ti
    PCPower & Cooling Silencer 750, CM Stacker 830

    AMD Rig: Biostar TA790GX A2+, x4 940 16x200, stock hsf
    2x2gb Patriot DDR2 800, PowerColor 4850
    Corsair VX450

  10. #10
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    Have tryed with å new Mist 500w powersupplay, but with the same resoult
    A64 3700+. 2 x 512 OCZ VX.
    POV 7800 GTX

    3D05: 13809. 3D 2003: 31366. 3D01:36755

  11. #11
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    Quote Originally Posted by calcal
    dfi boards are nothing but trouble <---
    But you get extras in return
    My heatware: http://heatware.com/eval.php?id=41179

    cpu: e6600
    mb: evga 680i
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    video: XFX 8800 GTS
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  12. #12
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    im starting to think all these issues are chipset related. NF4 doesnt seem to be as good as its touted to be.
    Asus Rampage Formula X48
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  13. #13
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    Quote Originally Posted by k00lance
    But you get extras in return
    what do you mean?

    Iwill P4r533-n_Intel 2.0A_512 PC800_Ati 9000p_Maxtor 60GIG_Generic PSU

  14. #14
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    Friend of mine lost his second 7800GTX also with that board...
    i9 9900K/1080 Ti

  15. #15
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    all the options anyone could ever imagine

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