Asus P5N32-E SLI Hardware User Manual page 58

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For a fully configured system, we recommend that you use a power supply
unit (PSU) that complies with ATX 12 V Specification 2.0 (or later version)
and provides a minimum power of 550 W.
Do not forget to connect the 4-pin/8pin EATX12V power plug; otherwise,
the system will not boot.
Use of a PSU with a higher power output is recommended when
configuring a system with more power-consuming devices. The system
may become unstable or may not boot up if the power is inadequate.
If you want to use two high-end PCI Express x16 cards, use a PSU with
500 W to 600 W power or above to ensure the system stability.
The ATX 12 V Specification 2.0-compliant (500 W) PSU has been
tested to support the motherboard power requirement with the following
configuration:
Normal Loading
CPU PSC 3.73G 1066
DDR800
1GB*2
VGA Nvidia 7800GTX*2
SATA-HD SATA*4
ESATA-HD 1
IDE-HD
1
CD-ROM 1
USB 2
PCI 1
If you want to use two EN7950GX2 graphics cards, visit the NVIDIA
website (www.nvidia.com) for the qualified PSU vendor list.
Chapter 2: Hardware information