1) Depends on the power supply.
2) Not necessarily
3) Yes, Check out Enermax EG365P-VE, EG365P-VE(FC), EG465P-VE, and EG465P-VE(FC)
NOTE
FC)=With Fan Controls and Thermal Sensor Options.
All of the above units are interchangable between the P4 and any AMD CPU based system. They include the AUX (Server Motherboards) connector, the 12V-P4 Connector and have the highest quality AMD thermal option we've seen.
They also have too many other features including super long (800mm) leads for hiding the cables or supporting even the largest tower. The ATX power is wrapped for better airflow and neatness. Finally, with 8+2 drive power wires, you'll be hard pressed to use them all.
You can check them out at:
http://www.enermax.com.tw/products/eg-365p-vefc.htm for the 365 & 465 models with Fan controls
and
http://www.enermax.com.tw/products/eg-365p-ve.htm for the 365 and 465 without the FC option.
Steve Benoit
Stable Technologies
'The way IT should be!'