OBS is choppy when...

I bought Elgato 4K X.
I started streaming, recording with 4K X & OBS, and the results were choppy.

But the results are fine, if I record with 'Elgato 4K Capture Utility'.

I tried changing 'color range, color format, color space, video format, video encoder' but it is still choppy.

I also tried 'Elgato Stream Link, NDI', it didn't work, either.

My recording system is 'RZ09-0409CE53, Razer Blade Advanced', GPU is RTX 3080 mobile. This system is able to play & record at the same time, at 4K HDR. And now I am using this for capturing only.
My another system has RTX 5080, I play games on this system.

I played and recorded on the laptop with RTX 3080 mobile for a while, and now I use this for capturing only. But the result is choppy, with OBS.
Elgato 4K Capture Utility's results are great.

I sent emails to Elgato, I got replies, they are working on it.

And here are video results.

 
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