Tested and working. Power supply was powered on and output voltages were checked with a multimeter. Cooling fan was also verified operational.

Test results:

• +12V rail: 11.98V
• +5V rail: 5.06V
• +3.3V rail: 3.37V
• +5VSB: 5.15V
• -12V rail: -12.07V
• Cooling fan: Tested working

Specifications from label:

• Manufacturer: Bestec
• Model: ATX0300D5WB
• Revision: A01
• Dell P/N: 0R850G / R850G
• Maximum output: 300W
• +12V: 18A
• +5V: 22A
• +3.3V: 17A
• -12V: 0.8A
• +5VSB: 2A
• Input: 100–127V 8A / 200–240V 4A, 50/60Hz

Includes the attached wiring harness and connectors shown in the photos. 120V Power Input Cable is NOT INCLUDED.No additional cables or accessories are included.

This is a used power supply and has minor scratches, marks, and other cosmetic wear consistent with previous installation and storage. See all photos for actual condition and verify the model, part number, dimensions, and connector configuration for compatibility before purchasing.