I have a 5800x3D and want to know if the 9900x/9950x/ 9900x3d or 9950x3d should be my next upgrade. My wife gets the 5800x3D upgrading from a Ryzen 5 3600 playing at 1440p

I have a 5800x3D and Im hitting 100% CPU Utilization frequently when gaming and multitasking, I think its time I move past 8 core and 16 Threads. Im looking at the 9900X/ 9950X or 9900x3D (Which was as low as $450 on Amazon briefly) and the 9950x3D. Im tempted to go with the 9950x3D but if I can get the 9900x3D for anywhere near $450 and then buy a x670E motherboard and 32-64GB of DDR5 6000 Mhz ram for nearly the same cost of the 9950x3D. What do y'all think? Running a 7900xtx for now until I can get a 9070XT, 5070TI, 5080, 5090. I play at 4K 240hz pretty much exclusively and Im noticing that upscaling is shifting alot more of the load on the CPU in my use cases and pushing 200-400 frames is taxing the CPU constantly to nearly or staying at 100% utilization. CPU isnt thermal throttling or anything just all the resources can and are used