Intel ATX 3.0, Design Manual

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Processor Configurations
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connected chassis component such as a PCIe* Card or motherboard 12V CPU
connector(s).
For example, a standard 2x3 PCIe* power connector supporting a graphics card will
draw no more than 6.75 Amps total through its three power pins and two ground pins.
Similarly, the 2x4 PCIe* power connector will draw no more than 13.5 Amps total
through three power pins and three ground pins.
It is possible to reduce the number of conductors consumed at the PSU by providing
the 12V to a 2x4 PCIe* card power connector through a 2x2 modular connector at the
power supply, for example. Before reducing the conductor count, the PSU designer
should also consider the copper losses and the resulting voltage drop incurred by the
two cable connectors and a length of the 18 AWG conductor.
This recommendation is based on common design practice. The PSU and system
designer may deviate from this guidance but remains responsible for designing the
PSU to meet all electrical, thermal, safety and reliability requirements based on the
application of the PSU.
It is important to recognize that the new 600W 12VHPWR cable/plug introduced with
PCIe* Gen 5.0 (detailed in Section 5.2.2.4.3 ), requires 16 AWG wire and a per-pin
current capacity of 9.2 A.
2.2.2 Overclocking Recommendations
The power levels listed in Section 2.1 - Processor Configurations - RECOMMENDED are
for processors that follow the Plan of Record (POR) power levels that include Turbo
Mode. If the processor is overclocked, then power requirements will be increased. If
the power supply is expected to support end users who intend to overclock then the
12V power rail to the processor should be higher than what is listed in Table 2-1 :
12V2 Current for Processor Configurations.
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