The Max Power for an ATX 4-Pin CPU Power Connector is 108W


Because the i5-9400F consumes 80W at-wall while loading 300 tabs in Chrome, which is a huge jump from 30W at idle, I want to know if it is safe using the only 4-pin CPU power connector on Gigabyte H310M S2V 2.0 (rev. 1.0).

I checked the 4.2.2.3 +12V CPU Power Connector (Required) in Single Rail Power Supply ATX12VO Design Guide and 4.2.2.5 +12V Power Connector in Power Supply Design Guide for Desktop Platform Form Factors. Molex 39012040 and 444761112 are used on the PSU and 39299042 on the motherboard.

The maximum current can be found in the Part DetailsElectricalCurrent – Maximum per Contact on their datasheet respectively:

  1. molex 39012040: 13.0A
  2. molex 444761112: 11.0A
  3. molex 39299042: 9.0A

Because the voltage is 12V and the minimum curent of the above parts is 9.0A, the maximum power is 12V x 9.0A = 108W.

Style Guide

The Style used in AmigoTechNotes

Reference

  1. Intel: Single Rail Power Supply ATX12VO Design Guide
  2. Intel: Power Supply Design Guide for Desktop Platform Form Factors
  3. molex: 39012040
  4. molex: 444761112
  5. molex: 39299042

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