[HELP] perf. RTX 3060 ti slower than GTX 1070 - NVEnc

[mimile]

hello
this is my preset for encode video Ultra HD in high quality:

NVEnc --y4m -i - --fps 23.976 --codec h265 --profile main10 --level 5.1 --tier high --sar 1:1 --lookahead 32 --output-depth 10 --vbrhq 19769 --max-bitrate 10000 --gop-len 0 --ref 3 --bframes 0 --no-b-adapt --mv-precision Q-pel --preset quality --colorrange limited --colorprim bt2020 --transfer smpte2084 --colormatrix bt2020c --max-cll 1000,923 --master-display G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1) --cuda-schedule sync --keyfile GENERATED_KEY_FILE --output "D:\Temp\The.Prote test.265"

"Only use encoder" is uncheck.

My processor is intel xeon e5-2637 v3,... without iGPU.

In task manager when encode with RTX, use :
100% video encode
6 % cuda
2% 3D
0 % video processing

when encode with GTX, use :
39-46 % video encode
9% "copy 1"
1% 3D