Rendering is extremely CPU dependent
Not if you're using a GeForce CUDA-enabled application (which I believe the Adobe applications are). Hell, there's a series of (slightly expensive) plugins for all the major 3D Animation/Rendering tools which let you render to your GPU instead of the CPU, shaving rendering time down to mere minutes instead of hours for large projects (on account of a GPU being a collection of about 1000 dumb CPUs).
It is a completely pointless exercise to work with video in Photoshop, for the same reason it's stupid to do animation in 3DS Max or write a dissertation in Unreal 4 UMG. The application isn't built for that, and the reason it has video support is not for the purpose you're trying to bend it into.
More to the point, rendering is a time consuming process on a CPU-bound system. It has to do one frame at a time, and if it takes 1 frame a second and there's 9000 frames to process...you do the math. RAM would help
slightly, but I suspect based on your history that you have a stuffty system to begin with, so the CPU itself and the motherboard's bandwidth aren't going to help matters.
You can try following
this tutorial from Adobe to see if your system is compatible with OpenGL Acceleration, but it probably won't make that much difference overall.
Either get a better application that is suited to the job, buy a better system or downscale the resolution and chop the frame count in half.
