Intel D845GEBV2 BLKD845GERG2-10PK User Manual

 79 

Power supplies used with the Desktop Boards D845GEBV2 and D845GERG2 must be able to 
provide enough standby current to support the Instantly Available PC (ACPI S3 sleep state) 
configuration as outlined in Table 43 below. 

Values are determined by specifications such as PCI 2.2.  Actual measured values may vary. 

To estimate the amount of standby current required for a particular system configuration, standby 
current requirements of all installed components must be added to determine the total standby 
current requirement.  Refer to the descriptions in Table 43 and review the following steps. 

1.  Note the total Desktop Board D845GEBV2 or D845GERG2 standby current requirement. 
2.  Add to that the total PS/2 port standby current requirement if a wake-enabled device is 

connected. 

3.  Add, from the PCI 2.2 slots (wake enabled) row, the total number of wake-enabled devices 

installed (PCI and AGP) and multiply by the standby current requirement. 

4.  Add, from the PCI 2.2 slots (nonwake enabled) row, the total number of wake-enabled devices 

installed (PCI and AGP) and multiply by the standby current requirement. 

5.  Add all additional wake-enabled devices’ and nonwake-enabled devices’ standby current 

requirements as applicable. 

6.  Add all the required current totals from steps 1 through 5 to determine the total estimated 

standby current power supply requirement. 

Total for Desktop Board 
D845GEBV2/D845GERG2 

370 

PS/2 ports  

(Note)

 345 

PCI 2.2 slots (wake enabled) 

375 

PCI 2.2 slots (nonwake enabled) 

20 

CNR (Note) 

375 

•  Estimated for add-on 

•  Add to Instantly Available 

USB ports  

(Note)

 500 

Note: Dependent 

upon 

system configuration