MeRcEnAiR
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I just got my beautiful 3080 Ti FTW3 Ultra in yesterday and oh boy, what an upgrade coming from a 1080 Ti SC2! Can anyone confirm if this model's fans are are controlled via PWM or by voltage? Reason why I ask; I'm running a dual system simultaneously from from one PSU, the Phanteks Revolt X which is inside of a Phanteks Enthoo Pro II. While a great PSU, the only/major downside is that all SATA and PCI cables are sent power 100% of the time as long as one of the two systems is on. My ITX build is running a server 24/7 while my ATX build is my main gaming PC that goes to sleep when not in use. As per this post (reddit.com/r/buildapc/comments/b386fv/revolt_x_dual_system_issue/), Phanteks confirmed that " There are some graphics cards that control the speed of the fans via voltage and some via PWM". So, at the moment, when my main PC with the 3080 Ti goes to sleep, its fans spin at 100% even though nothing is happening. This wasn't an issue with my 1080 Ti SC2. I don't know if there's much I can do to be honest other than letting both systems run a full 24/7 but any insight would be greatly appreciated!
post edited by MeRcEnAiR - 2021/07/06 06:56:01
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engomez
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/19 17:23:46
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Did you ever figure out a workaround here? Keeping both systems on 24/7 seems in-ideal.
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ty_ger07
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/19 17:55:12
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☼ Best Answerby MeRcEnAiR 2022/03/25 12:59:58
The regular fans are controlled by PWM, but the aux fan header is controlled by voltage. When the PC goes to sleep, the GPU auxiliary power normally drops to 0 volts. But since you are powering it by a PSU which isn't properly triggered into sleep mode, the auxiliary GPU power is still present. The motherboard is telling the GPU to shut off, the GPU firmware halts the GPU, and it is normal for the fans to ramp up to 100 percent when the card is in a halt state while auxiliary power is applied. Essentially, in an abnormal condition, the default behavior is for the fans to operate at 100%. Any time the GPU core is turned off while the card is receiving power, that is an abnormal condition, and it is expected that the fans operate at 100%. It sounds like it is working as expected The only way around it that I can think of is for you to connect the GPU fans directly to the motherboard (or to something directly controlled by the motherboard). But still, you are operating the GPU in an abnormal way, and who knows how it may be affected long-term. It seems like there must be a different way to do this, or a solution invented which you are not implementing. Is it a big deal to run the two systems off of separate power supplies, to operate them as they are designed to be operated?
post edited by ty_ger07 - 2022/03/19 19:12:42
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RogueMaster
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/20 13:40:54
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Given that the op posted this in July of 2021, and hasn't been back since August of 2021, I would not expect to see a reply to this thread necro by the op.
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ty_ger07
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/20 18:36:39
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My reply was to engomez who asked the same question yesterday.
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engomez
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/20 20:11:15
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Problem is the case I have (evolv x) doesn't support dual PSU. It is sold and marketed as being able to run two systems, which, because of this issue, is only practical if both systems are meant to be turned on 24/7. You can't just have one 24/7 and one on sometimes. So you can't e.g., run one system as a NAS (my original intent) 24/7 and the other system (e.g. for gaming) selectively.
So yes, I could go a dual-PSU route, but then I'd need a whole new case and PSU :(
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MeRcEnAiR
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/25 12:58:54
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engomez
Did you ever figure out a workaround here? Keeping both systems on 24/7 seems in-ideal.
No I did not unfortunately! engomez
Problem is the case I have (evolv x) doesn't support dual PSU. It is sold and marketed as being able to run two systems, which, because of this issue, is only practical if both systems are meant to be turned on 24/7. You can't just have one 24/7 and one on sometimes. So you can't e.g., run one system as a NAS (my original intent) 24/7 and the other system (e.g. for gaming) selectively.
So yes, I could go a dual-PSU route, but then I'd need a whole new case and PSU :(
Yes, unfortunately there doesn't appear to be any workarounds. As mentioned by @ty_ger07, the system is technically working as intended. I did not test this with another GPU or brand so I can't confirm it to be true across all GPUs.
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engomez
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/26 17:17:10
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MeRcEnAiR
Yes, unfortunately there doesn't appear to be any workarounds. As mentioned by @ty_ger07, the system is technically working as intended. I did not test this with another GPU or brand so I can't confirm it to be true across all GPUs.
I think I found a workaround: - There are fan pins at the underside of the card. They are multicolored. These control the fan speed of the GPU. What happens is that when the card is getting power but the motherboard isn't on, the fans still get power but nothing controls the fan speed, so it goes to 100%. What you can do (I'm still testing this and no guarantees..) is unplug those three fan pins from the GPU and connect them directly to your motherboard via these cables: CRJ Male Mini 4-Pin GPU Fan to Female 4-Pin PWM Adapter Cable If you wan't to consolidate the three cables into one, you need a normal fan splitter cable: 3 Way 4 Pin PWM Fan Splitter Cable The fans would now be controlled fully by your motherboard and they won't spin if your motherboard is not on. Motherboard bios don't have GPUs as a source for then fan control usually, so you'll need to use software like "Speedfan" to control it based on GPU temp. You can set bios to source from the system temp if you want, Speedfan will override it once Speedfan has been loaded on the OS. I'll update once I get a chance to fully set it up.
post edited by engomez - 2022/03/26 17:21:00
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ty_ger07
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Re: RTX 3080 Ti FTW3 Ultra fan control via PWM or voltage?
2022/03/27 15:46:55
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I think I had seen someone mention something like that in post #3. :-P
ASRock Z77 • Intel Core i7 3770K • EVGA GTX 1080 • Samsung 850 Pro • Seasonic PRIME 600W Titanium
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