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1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power

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avengerx
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2022/11/23 07:16:49 (permalink)
Hello!
 
Here's a summary of my question:
- LED D3909 in the back of the GPU is lighting up in my GPU when it turns down while gaming. The MEM LED turns off when this one turns on and display blacks out. System is still responsive, so I can press the power button and gracefully shutdown Windows. What's this LED about?
 
Now the long version
I'm running my 1080 Ti KPE in a little overclock, just using Precision X OC 6.2.7 (latest version that really supported the card). Stock air cooling.
The settings I'm using are:
- Power Target: 120%
- Temp Target: 70C (priority)
- GPU clock offset: +37 MHz
- MEM clock offset: +600 MHz (tried to lower to +550, +500, for no avail)
 
I can play with these settings for long long sessions. Sometimes it throttles to keep the card under 70C, and I add a little outside air cooling (air conditioner duct straight to the card), so it keeps reasonably cool when the a/c kicks in. Yes, that's not a bit power efficient...
 
I checked all temps with PXOC open in 2nd display, none of the sensors are bumping beyond 70 C, ever. In general only GPU gets to 70C, mem, power, all behind 60C, 65C tops, if ever.
 
But just sometimes, at random, the card would "shut down", turning off the MEM light, yet lighting a D3909 LED behind the backplate (needed to remove backplate to see the component and number, but the light is visible when it comes up even with the backplate on). That strange LED sits nearby the BIOS selector switch (but its in the back of the card).
 
The LED seems to be related to some protection to the card's memory, alright. It's probably shutting down the memory power rail to prevent it from busting (thus the MEM light turns off), which is cool. But it lits up to tell me something's not right, and I am not really sure what, as I couldn't find any reference to that LED anywhere (xdevs.com guide doesn't mention it).
 
My SW 100, 101 and 3401 are all in the stock (off) positions, thus all running in stock voltages. It would be nice if I could have further technical documentation on the GPU to troubleshoot it.
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    Sajin
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    Re: 1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power 2022/11/23 11:19:33 (permalink)
    Does this happen with the card at stock clocks?


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    avengerx
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    Re: 1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power 2022/11/23 14:58:04 (permalink)
    Sajin
    Does this happen with the card at stock clocks?



    It probably doesn't, but to be honest, I only play overclocking it. So to say with some level of confidence, I would need to play another week or two without touching the knobs. For now I reduced memory o/c to 500MHz, but I'm sure that LED is there for a reason, and I believe it is to serve as a guide in extreme overclocking. It's just a pity there's no documentation anywhere I looked. Hoping some could come up.
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    Sajin
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    Re: 1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power 2022/11/23 16:41:41 (permalink)


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    avengerx
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    Re: 1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power 2022/11/24 05:40:24 (permalink)
    Sajin
    Found this… https://forums.evga.com/FindPost/3035532

    That's really about it!.. And great clue from post #16 in that thread!
     
    For future reference (and hopefully any google indexing to get the reference! haha):
     
    Cool GTX
    Update ... I got a reply to my PM from Tin_EE 

    TiN_EE
    If I remember right:
    D3905 indicates MCU firmware status. Normal operation should be never on.
    D3909 shows memory VRM status. Might be issue with memory power/VRM.

     
    So, memory VRM (voltage regulator module) status. Or, rather, a memory "breaker tripped" indicator led. Now, it probably "trips" due to heat (localized heat not caught by the 10 sensors in the board). If so. my hopes are up, I most likely need to disassemble the whole thing and apply new thermal pads... I already bought some a few months ago but I can't find the darn pads for the life of me!.. 😫

    Or, could this be "tripping" because I'm giving the memory too low voltage for the higher clock? I might try pushing a bit in the SW100 to add more voltage...
     
    I have lowered memory clocks and will run like that for some time, until I need to go stock speeds (for the few FPS in the extra clock), but this thing tripping at ~600MHz sounds like an horrible sample, given in the OC tests Vince stated in average 800MHz was working on air cooling... Well, given the years of service the board have been... I don't know. It makes sense, I may need to add power for the memory to stabilize (and need to change power before boot for that "OS training" issue to be avoided).
     
    Thanks for finding that thread, it was a gem buried within the forums! Google really indexed that page but it probably has a very low score of sorts for how many people have had this board it seems. I could only find the thread when I really looked up for it in google. :P
     
    It's a shame there won't be a 4090 KPE.
     
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    Sajin
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    Re: 1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power 2022/11/24 12:07:19 (permalink)
    No problem.

    It could be tripping because the voltage needs a slight bump, but it seems like the power rail for the mem has an issue since the mem light goes out. If this issue occurs at stock, oc’d & oc’d and ov’d then I’d say the mem power rail has a problem.


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    avengerx
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    Re: 1080 Ti Kingpin D3909 LED lits up and MEM rail reports no power 2022/11/24 13:03:17 (permalink)
    A little update on that, and not sure this helps much, but it looks like the KPE 1080 Ti comes with a bundled "EPOWER V.5" sort of power board. This helps understand what the hell "vdroop" in SW100 and SW101 are.
    - Thread on EPOWER V
    - PDF version of the guide above (or the other way around) in particular, pages 24 and 25.
     
    The differences are:
    - SW3401 switch is like VOFS, but comes in increments of 25mV in KPE 1080Ti instead of 80mV from EPower V.
    - there's no "force" switch pair, instead there's the memory's "Vdroop" switch (SW100), that's not present in EPower V
    - the GPU "Vdroop" switch seems to be the same, so SW101 relates to DROOP
     
    Basically, by what I could understand from the guides (my assumptions base also on reading the KPE 1080Ti uncorking guide), the "Vdroop" switches are used to determine where power to the memory or GPU are sensed; switching only one dip kind of balances sensing between the power board and GPU (via a passthru 0-ohm resistor). This can be used to "compensate" loss of voltage in the circuit that negatively affects measurements from the whole power module.
     
    The usefulness of this is pretty clear in the EPower board, especially when you may de-solder those zero-impedance resistors and pull a twisted pair of wires straight to the board to make the measure closer to the GPU (remote sensing). But I suppose KPE should already be wired to go that close, stock (without changes/soldering)? So I'm not sure this should be very helpful here.
     
    I am trying the setting at 50% Vdroop for memory now (just one switch turned on), going a little more aggressive on the o/c, and see what happens. Once it lights up the 3909, I may try it at 100%. I really don't see much point in figuring out if KPE 1080Ti has equivalent RFP/RFN to solder a bridge ("remote sensing" from EPower guides), as the board is all bundled and its "on" position probably has good rails straight to the points of interest.
     
    I am also not sure all this vdroop thing should be needed in "light overclock" that's not LN2 extremes...
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