X399 Taichi throttles after an hour of streaming

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.

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

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.

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

Nicer he says. 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

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.