pepe1914

As i said in the "RAM and Power Supply Support" Forum i have the same problem. I think it's not a PSU problem (mine is Antec Neo power 550w). My needs according eXtreme PSU calculator are:
System Type: Single Processor
Motherboard: Regular - Desktop
CPU: Intel Core 2 Duo 6750
CPU Utilization (TDP): 85% TDP
RAM: 1 Stick DDR3 SDRAM
Video Card: NVIDIA GeForce
Video Type: Single Card
IDE HDD 7200 rpm: 2 HDDs
DVD/CDRW Combo Drive: 2 Drives
Floppy Drive: 1 Drive
Fan Controller: Yes
Fans
Regular: 1 Fan 120mm;
Keyboard and mouse: Yes
System Load: 90 %
Recommended Wattage: 237 Watts
According Asus PsuTester are 400W.

So i think it's not a PSU problem I think is a default in the design of the Asus series P5k or Bios
In the many forums including Asus are a lot of topics about this problem but no solutions.
I hope Asus will correct this problem soon.