Intel ATX 3.0 User Manual

PCI Express* Add-in
Card Considerations
24 336521
 If Rest of Platform power is higher than what is in the table, increase the PSU
size respectively.
 If Rest of Platform power is lower than what is listed in the table the PSU size
can also be reduced, but Peak Power requirements are also expected to increase
beyond what is listed in Table 3-3
.
• CPU Power and Rest of Platform Power can vary from this table which would result
in custom Peak Power requirements
3.1.2 PSU Power Excursion
Based on the power budgets in Table 3-2 and peak power of both the Processor
detailed in Table 2-1 and the PCIe* Add-in Cards in Section 3.1
, the following Peak
Power Requirements are defined for the Power Supply. The peak time for each power
level is defined in
Table 3-3. The PCIe Add-in cards power excursion are only
designed for the new 12VHPWR connector, therefore the table is split into two
different power levels where it is expected that power supplies greater than 450 watts
will have at least one 12VHPWR connector.
Table 3-3: PCIe* AIC and PSU Power Budget used for Peak Power Excursion
Power Excursion
% of PSU Rated Size
PSU ≤ 450 Watts &
PSUs without
12VHPWR Connector
Power Excursion
% of PSU Rated Size
PSU > 450 Watts &
12VHPWR Connector
present
Time for Power
Excursion (TE)
Testing
Duty Cycle
100% 100% Infinite --
110% 120% 100 ms 50%
135% 160% 10 ms 25%
145% 180% 1 ms 20%
150% 200% 100 µs 10%
NOTE: Peak Power defined in this table correspond to Platform Level Power Budgets described
in
Table 3-2 if CPU or Rest of Platform power is reduced from Table 3-2 to reduce PSU
size, then custom Power Excursion % of PSU rated size must also be calculated.
The Testing Duty Cycle is not defined in the PCIe* CEM Gen 5.0 ECN, but it must be
defined to create a test criteria specific to a power supply. The Testing Duty Cycle
defines the percentage of time the Power Excursion value peaks with the remainder of
the time defined as a Time_Constant (T
C
). The Power Level defined is to have the RMS
value during this Dynamic Load test to be the Rated Wattage of the Power Supply.
Table 3-4
shows an example of how the testing criteria for power excursions of 1000
Watt Power Supply using an RMS value to average the rated power of a power supply.
This calculation is the same as what is described in the PCIe* CEM Gen 5 Power
Excursion ECN. For all power supplies with a rated wattage different than 1000 watts
a similar RMS calculation needs to be performed.

Intel ATX 3.0 Specifications

General

Brand	Intel
Model	ATX 3.0
Category	Computer Hardware
Language	English