Pcie* Add-In Card And Psu Power Budgets; Figure 3-1: Pci Express* Cem Add-In Card Power Excursion Limits Chart - Intel ATX 3.0 Design Manual

Average Power Calculation
≥ 1,000,000 µs (1 sec)
NOTES:

Figure 3-1: PCI Express* CEM Add-in Card Power Excursion Limits Chart

3.1.1

PCIe* Add-in Card and PSU Power Budgets

Three dominant power demands dictate the total system power provisioning:
1. CPU power consumption
2. PCIe Add-in Card power level
22
Interval Length in
microseconds(µs)
"T"
R =
average power during internal T
Max Sustained Power (ie.TDP)
1.
2. This is also the max ratio of instantaneous power relative to maximum sustained
power.
3. ln() is the natural logarithm function.
4. Add-in Card must at all times and concurrently adhere to power excursion limits for
all time interval lengths as well as the limits defined for Power Supply Rail
Requirements in Table
5. Engineering Change Notice for up to 300 Watts (Work in Progress) will likely make
this table apply to all cards mounting the 12VHPWR connector.
Ratio of Average Power1 in
Interval "T" Divided by
Maximum Sustain Power
1
.
3-5.
PCI Express* Add-in
Card Considerations
Notes
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