New Sony Playstation PS3 and older PS3 size connections and slots comparison - YouTube
P&Y, 4 Ports USB Hub 2.0 With SD Card Reader Slot Adapter For Playstation 3 Slim PS3 Slim - AliExpress
What were these memory slots used for? Obviously memory stick duo was for psp, but what about the SD and CF ones? I didn't even know what CF was until now :