This series also had an external power supply whose first runs were prone to malfunction and combustion, but this issue was eventually resolved with the fifth and final models (SCPH-9xxxx), where the power supply was again mounted inside the console. However, it removed the expansion mechanism for a hard disk. This series reduced both the weight and the power requirements of the console and integrated the network adapter. In 2004, Sony revealed a fourth, slimmer model (SCPH-7xxxx). This series retained the expansion bay, but the FireWire was removed, adding instead a remote control sensor.

The third revision (SCPH-5xxxx) was also 'fat'. These had the same USB ports as the 1xxxx series and added an i.Link (FireWire 400 4-pin) port, but in lieu of the PC Card slot was an internal expansion bay for an optional 40 GB hard disk and dual network adapter as well. The second-revision models, also 'fat' (SCPH-3xxxx), were released worldwide. When it was first released to the public in Japan, the so-called 'fat' PS2 (SCPH-1xxxx) had two USB ports and a PC Card slot, which was used for connecting the PlayStation 2 Broadband Unit, a device that incorporated an external hard disk and network adapter for use with the console. The PlayStation 2 saw the greatest number of hardware changes for any console over a span of more than a decade, divided between five different case styles.

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