I think the GPU is going to be the limitation but I tested the X3D vs freq(CCD1) anyway.
Tested with: Ryzen 9 7950X3D(SMT ON) /w 64GB 6000MHz CL30 RAM + RTX4070
X3D(CCD0) Only
Performance: motion vectors estimation = 8420
Performance: CPU-based frame rendering = 13468
Performance: GPU-based frame rendering = 11116
Freq(CCD1) Only
Performance: motion vectors estimation = 8627
Performance: CPU-based frame rendering = 13578
Performance: GPU-based frame rendering = 11364
X3D(CCD0) + Freq(CCD1)
Performance: motion vectors estimation = 16936
Performance: CPU-based frame rendering = 21305
Performance: GPU-based frame rendering = 11364
I normally use Rife x3 @1080p which results in not much of a CPU load in regards to SVP.