Architecture of Consoles (2020)
copetti.org
copetti.org
One of the interesting tradeoffs with AR/VR systems is that there is less emphasis on just frames-per-second, and more emphasis on consistent latency and low lag between user input and photons coming out of the screen. This may continue to drive a divergence between dedicated AR/VR systems and "normal" game consoles & PCs. The input requirements for AR/VR are also much higher than a game pad sampled at high frequency.
Related: a couple of good articles on the Xbox 360 architecture from Jon 'Hannibal' Stokes