Geekbench ain't a good indicator for the performance of a video game system... its focus is on other calculations than game graphics and physics.
GFX-Bench's T-Rex benchmark is ancient and uses the outdated OpenGL ES 2.0 instead of OpenGL ES 3.1 or Apple's "Metal".
The two most demanding GPU-tests (and most similar to game console's demands) are Futuremarks "Slingshot Extreme Unlimited" and GFX-Bench's "Car Chase" benchmarks.
Unfortunately even the newest iOS-devices still don't support the Car Chase benchmark.
https://gfxbench.com/result.jsp?benchmark=gfx40&test=681&text-filter=&order=median&ff-smobile=true&os-Android_gl=true&os-custom_gl=true&os-iOS_gl=true&os-iOS_metal=true&os-Linux_gl=true&os-OS_X_gl=true&os-OS_X_metal=true&os-Windows_dx=true&os-Windows_gl=true&pu-dGPU=true&pu-iGPU=true&pu-GPU=true&arch-ARM=true&arch-x86=true&base=device
