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To find the PSU requirements for the Intel boards you need to look in the technical specification of the board: http://downloadmirror.intel.com/16958/eng/DQ45CB_TechProdSpec.pdf Under Technical reference >electrical considerations> Power supply considerations.
For this board it says:
The +5 V standby line from the power supply must be capable of providing adequate
+5 V standby current. Failure to do so can damage the power supply. The total
amount of standby current required depends on the wake devices supported and
Additional power required will depend on configurations chosen by the integrator.
The power supply must comply with the indicated parameters of the ATX form factor
• The potential relation between 3.3 VDC and +5 VDC power rails
• The current capability of the +5 VSB line
• All timing parameters
• All voltage tolerances
For example, for a system consisting of a supported 65 W processor (see Section 1.4
on page 14 for a list of supported processors), 1 GB DDR2 RAM, one hard disk drive,
one optical drive, and all board peripherals enabled, the minimum recommended
power supply is 90 W.
Dosen't really help too much... Just add up all the individual components power requirements and then go a bit higher and you will be fine!