The older console uses less advanced chips, is simpler to make and provides a budget-friendly alternative to the flagship model.
Sony's PS5 Outstrips Predecessor with 10 Mln Units Sold Since Nov. Launch
PS5 Stock Shortages are Still Prevalent; Sony Decides To Make More PS4
PS5 Stock Shortages Force Format to Fall Behind Xbox for a Second Week in Japan
Sony is dealing with PlayStation 5 shortage by making more PS4s - The Japan Times
PlayStation offering direct PS5 sales for Christmas
PS5 Has Been Rapidly Outpacing PS4 Sales In Japan : r/PS5
Sony to keep producing PlayStation 4 amid PlayStation 5 shortage
PlayStation 5 “Long-Term Supply Issues” Are Resolved, says Jim Ryan – GTPlanet
Sony to keep producing PS4 consoles as it deals with PS5 shortage, report says - CNET
Sony raises price of PlayStation 5 console due to soaring inflation
Sony cuts profit outlook on weaker PlayStation prospects - The Japan Times