Type - Type PSU:

a. Active PFC and Passive PFC PFC
is a measure of efficiency of a PSU. Measured by how much power is wasted into heat. The calculation is from 0-1, close to 1 means more efficient. Active PFC uses its own separate chain to offset the charge induction while the passive PFC capacitors rely on charge to be induced. So clear why the PSU with active PFC is more expensive.

b. Peak Power and Peak Power Continues power
is the maximum power that can produce the PSU when needed. So that was issued when additional power is needed. Continues power is a constant power PSU issued so often called pure power generated power is more stable. So the PSU continues better used to supply the power needs of smaller PSU eg 600w continues to systems with a total of 500W. Because if forced to supply a higher power can damage the PSU. In a measure of stability continues PSU better than the peak power for peak power exceeding the power to issue kapasitanya in just a few seconds just so it is not constant for the long term can lead to damaged PSU.

c. Modular and non modular PSU modular
is the development of the PSU where the cable from the PSU can be removed and installed as needed so that cables do not need to be removed. Keuntunganya become more tidy the wires and water-flow more smoothly in the casing.
Some misguided about PSU :

1.PSU a great power is always better than its smaller PSU which is not necessarily because the size of watts can not be used as a benchmark in choosing a PSU. Note also ripplenya that its useless to have a great PSU but flutuasi voltnya very high. In fact it will damage other hardware components such as hard drives. also note that efficiency can be produced PSU continues.

2.PSU Multiple Rail nicer multiple Rail In certain circumstances it can make things worse. As explained previously that multiple rails are split rail into several parts. What matters if the rail that is used has a small amperage thus produced less wattage. Examples of such total +12 v 35A +12 V1 25A is divided into and +12 V2 10A +12 V2 rail if used for a VGA connector that requires more than 120W of power it will affect the performance of the VGA. So keep in mind how big rail or not produced enough to meet the needs of the component.

3.Active PFC Efficiency nicer thus saving on electricity bills if you live in Europe may be true because in Europe already use active PFC is where the calculation to use your electricity bill the VA.

4.PSU which could raise greater than the rating system capacity means the good thing is that it seems needs to be clarified. For example flare occurred wattnya test on a small PSU 400-450W can lift system core 2 quad high range with a high-end VGA as well. The test came back showing the PSU was still able to handle and railnya stable. But keep in mind that the PSU is not measured by whether or not capable to handle large power PC but also assessed from durabilitynya. How old PSU to survive. Do not until you buy a small watt PSU for your high-end systems because of the use of relatively old PSU will be damaged or decreased its ability of being forced to work at the PEAK power continuously.