Intel ATX12VO User Manual

PCI Express* Add-in Card Considerations
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2. PCIe* Add-in Card power level
3. Rest-of-Platform power demand
Rest-of-Platform (ROP) collectively includes anything in a system (memory, storage,
motherboard, peripherals, etc.) not including the PCIe* Add-in Cards or CPU. Table
3-2 provides examples that generally balance these three power demands to obtain an
overall PSU power rating. The PCIe* power entries in the table are standard power
levels for PCIe Add-in Cards defined in the PCIe* CEM 5.0 Specification. As a
consequence of the introduction of 450W and 600W Card power levels, the wide range
of possible PCIe* card power demands plays a dominant role in setting total platform
power supply ratings.
These configurations will also serve as test cases for evaluating power supply
excursions. The peak power demands of the PCIe* Add-in Cards at each power level
can guide the peak power demands of the PSU.
In cases where a PCIe* Add-in Card has a sustained power not listed, use these
values as a minimum value for all cards up to these power levels. The table below is
seen as a minimum power level based on Rest of Platform (ROP) power. The ROP
assumptions are shown in Table 3-2
below. If a system designer plans more ROP
power, the overall platform power budget for a system must be increased. If a
system designer plans less ROP power, then the PSU size can also decrease. In the
case of ROP values lower than what is shown in Table 3-2, the calculations should be
done for Peak Power Requirement for this specific system. If the Peak Power
requirements for this specific system exceed the values shown in
Table 3-2 than a
PSU with support for higher peak power levels would be needed.
The CPU continuous power comes from Table 2-1, taking the current value and
multiplying by 11.2 Volts to create a power value and round up slightly. The CPUs
used in these examples are the 65w TDP for the first row and 125w TDP for all other
rows.
This is a recommendation for a Power Budget and guidance that is needed to define
PSU Peak Power Excursion levels. These power budgets also assume only one PCIe*
Add-in Card will use these power excursions. If more than one PCIe* Add-in Card is
installed in the system, then the system designer needs to verify the power supply can
provide enough power for all components in the system including the Peak Power
Excursions of all components. This industry standard PSU Design Guide does not
provide a standard definition for that type of system design.
Table 3-2: PCIe* AIC and PSU Power Budget used for Peak Power Excursion Test Cases
PCIe* AIC
Power
CPU
Continuous
Power
Rest of
Platform
PSU Rated
PSU Size
75 275 100 450
150 300 100 550
225 300 125 650
300 300 150 750
450 300 250 1000
600 300 300 1200

Intel ATX12VO Specifications

General

Brand	Intel
Model	ATX12VO
Category	Power Supply
Language	English