The monetary rule of thumb for parent is CPU and GPU is a bit flawed.
This will work great if all games were designed the same, but they're not.
Some games are more GPU intensive with little CPU usage, while others pull more resources from the
CPU and barely touching the GPU.
The first thing you need to do is check out the demands of the games you plan on playing.
No.
Generally speaking, if you're making a generic gaming rig, then yes.
This methodology is an easy road to take.
You take your budget for GPU and CPU and allocate roughly somewhere between two thirds towards the GPU
and the remaining one third to what the CPU up to take in.
Invested in a CPU.
That's half the cost of the GPU.
This is often a safe bet across the board for a general non game specific gaming rig.
I would stick with that general skill.