Cerny also confirmed the PS5 will be backwards compatible with PS4 games, as the two consoles are built upon similar internal architectures.

In terms of which games players can expect to play, the full list hasn't been confirmed. However, Cerny noted that PS4's 100 most played games will be playable on PS5 at launch and all will run even better than before. "Running PS4 and PS4 titles at boosted frequencies has also added complexity," Cerny said. "The boost is truly massive this time around and some game code just can't handle it. Testing has to be done on a title by title basis.

From your own article. Please stop spreading misinformation.