Entry-Level Power Supply Specification
Encyclopedia
Entry-Level Power Supply Specification (abbreviated EPS) is a Power Supply Unit meant for high end computers and entry-level servers. Developed by the Server System Infrastructure forum (which is a group that works on server standards), the EPS form factor is a derivative of the ATX
form factor. The EPS standard provides a more powerful and stable environment for critical server-based systems and applications.
Power supplies built to the EPS standard include a 24-pin motherboard power connector and an 8-pin +12V connector. The standard also specifies two additional 4 pin 12V connectors for more power hungry boards (one required on 700W-800W PSUs, both required on 850W+ PSUs) . EPS power supplies are in principle compatible with standard ATX
or ATX12V motherboards found in homes and offices but there may be mechanical issues where the 12V connector and in the case of older boards the main connector overhang the sockets. Many PSU vendors use connectors where the extra sections can be unclipped to avoid this issue. As with later versions of the ATX PSU standard there is also no -5V rail.
The latest specification is v2.92.
ATX
ATX is a motherboard form factor specification developed by Intel in 1995 to improve on previous de facto standards like the AT form factor. It was the first big change in computer case, motherboard, and power supply design in many years, improving standardization and interchangeability of parts...
form factor. The EPS standard provides a more powerful and stable environment for critical server-based systems and applications.
Power supplies built to the EPS standard include a 24-pin motherboard power connector and an 8-pin +12V connector. The standard also specifies two additional 4 pin 12V connectors for more power hungry boards (one required on 700W-800W PSUs, both required on 850W+ PSUs) . EPS power supplies are in principle compatible with standard ATX
ATX
ATX is a motherboard form factor specification developed by Intel in 1995 to improve on previous de facto standards like the AT form factor. It was the first big change in computer case, motherboard, and power supply design in many years, improving standardization and interchangeability of parts...
or ATX12V motherboards found in homes and offices but there may be mechanical issues where the 12V connector and in the case of older boards the main connector overhang the sockets. Many PSU vendors use connectors where the extra sections can be unclipped to avoid this issue. As with later versions of the ATX PSU standard there is also no -5V rail.
The latest specification is v2.92.