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X399 Taichi throttles after an hour of streaming

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KJM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KJM Quote  Post ReplyReply Direct Link To This Post Topic: X399 Taichi throttles after an hour of streaming
    Posted: 24 Mar 2018 at 3:04am
Hi,

Strangest thing I'm experiencing.
I use OBS to stream my games while recording.

My Threadripper 1950x never reaches over 68C. My GPU is at 71C. Overclocked to 4GHz @ 1.4v.
But after an hour of gameplay, I see the framerate reducing, then game stutters for 0.5 seconds, drops frame in half (160 to 90 fps for a seconds). 

No matter what I do, after an hour of gameplay + streaming, I get frame drops and stutter.

I'm using LLC 2 for CPU, then auto for the chipset.

DDR4 3200 stable at 1.36 (14-14-14-34). Prime95 and memtest ran for 8+ hours, no errors.

Titan Xp GPU usage is well under 80%.
VRM temperature goes upto 67~68C.

What other settings can I try? Seems like motherboard is throttling.
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TANWare View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TANWare Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 3:19am
If the GPU remains at 80% when the system throttles then it is most likely the GPU lowering the FPS.
x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
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wardog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 6:12am
If water cooling, place a 120-140mm fan SAFELY and SECURELY over the VRM section between the processor and rear I/O shield and report back
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KJM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KJM Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 8:12am
@TANWare, GPU usage doesn't get stuck at 80%; I just make sure that the maximum doesn't reach over 80% for OBS frame processing + streaming. I tried 100% fan curve for Titan Xp, temp lowered but GPU usage remains so I don't it's thermal throttling.

@wardog I already have 120mm x 3 radiator on the top + 140mm on rear side of the case. The rear fan runs at 980 RPM though. I'll try it with 1500+ RPM fan and see if it makes any difference.


Edited by KJM - 24 Mar 2018 at 8:13am
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wardog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 8:26am
Originally posted by KJM KJM wrote:

@wardog I already have 120mm x 3 radiator on the top + 140mm on rear side of the case. The rear fan runs at 980 RPM though. I'll try it with 1500+ RPM fan and see if it makes any difference.


Na. Case mounted fans don't "get' it. All AiO cooler manuf's now say to install one like I have done in the pic below. Mind you, it's far easier to do here in the cavernous Tt Core X9 case as the MB resides horizontally.


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TANWare View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TANWare Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 2:17pm
I have mine as a 40mm fan, fits much nicer. As far as VRM temps it did lower under extreme load 5c to 90c but that needs extreme load to get there. I used to idle at about 32c now idle at 28c. Under real world high loads usage never above 55c now under about 45-48c.
As far as CPU, when the frame rate drops if usage of the GPU does not drop significantly at the same time usually then the CPU is not the throttle cause. If you were playing the game and at the time the GPU average usage was 80% and then frame rate cuts in half and the GPU average usage drops to 50% then the CPU has somehow stopped feeding the CPU.  
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wardog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 5:07pm
Originally posted by TANWare TANWare wrote:

I have mine as a 40mm fan, fits much nicer.


Nicer he says. Tongue hahahaha

Tan, that fan lays there like it was designed to belong there. 140mm Fractal.

When I was doing 3DMark runs in my Sig @ 4.0GHz that fan made the world of difference.

Nicer.......... hahahah Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TANWare Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 9:41pm
Yeah the 140mm is just too big, it covers the water block etc. the 40mm fits nicely in that little nook created besides the water block. Agreed no where near the air volume though.
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KJM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KJM Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2018 at 11:34pm
Thank you all for good tips. I think Taichi X399's VRM temp is still lower than every other x399 mobos out there, so didn't think of cooling them.

However, the culprit was G-SYNC.
I turned off G-SYNC while OBS streaming + recording games, the stuttering and decline in FPS is gone.

Can't believe I paid extra for G-SYNC monitors and Titan Xp for stuttering experience.
With all the GPP drama, I'm 100% certain that I'll take AMD route in near future.
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TANWare View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TANWare Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2018 at 1:04am
Good deal, GSync will cause the GPU to loose load.
As far as VRM temps HWMonitor showing the average VRM temp never got over 55c here, it is using HWInfo64 showing the VT1&2 temps of the VRM controllers on the CPU rail that got overly hot (95c).
x399 Taichi, 1950x, 32GB 3466 DDR4
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