Processor Configurations
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2 Processor Configurations
2.1 Processor Configurations (Recommended)
The processor power in a desktop computer is provided by the 12V2 power rail of
power supplies with multiple power rails. To meet the desktop processor power needs
a desktop power supply must provide the current value list in Table 2-1 for the 12V2
voltage rail. Table 2-1 shows the various processor current requirements represented
by the desktop processor’s TDP. If a power supply only has one 12V rail, then Table
2-1 shows the amount of current that needs to be dedicated to the desktop processor
in a system level power budget.
Table 2-1: Processor Configurations – 12V2 Current
PSU 12V2
Capability Recommendations
Processor TDP Continuous Current Peak Current
150 W 33 A 60 A
125 W 26 A 39 A
65 W 23 A 34 A
35 W 11 A 19 A
NOTES:
If the power supply supports the 240VA Energy Hazard protection requirement, then
current levels for the 12 Volt rail above 18 Amps would have to be split into multiple
12V rails.
Continuous current is defined for the processors PL2 (Turbo) power limit since desktop
processors are expected to stay at PL2 for many seconds, sometimes close to 1 minute.
For a PSU any time over 1 second is considered Continuous current.
Peak Current is defined for the processor’s PL4 which defines Peak current for a max
time of 10 ms.
All future processor power/PSU current requirements will be defined in a document
titled ATX12VO and ATX12V PSU Design Guide Addendum (# 62148
4) that is
applicable to both Single Rail and Multi Rail ATX Power Supplies. Refer to that
document for details of where these values come from.
2.2 High End Desktop Market Processor
Considerations
The High-End Desktop market requires power supplies with higher power levels than
typical mainstream market. The EPS12V specification is often referenced for these
designs. The EPS12V specification is a power supply form factor for the server market.
This Desktop ATX12VO Single Rail Power Supply design guide includes higher power
levels to support these higher performance desktop computers.
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