Power Supply Unit or PSU, the Main Power for Our Computer, Better PSU will make our computer life more longer. Just like my experience, 2 years ago, I bought desktop computer with ordinary PSU, I used the computer daily and no overclock. But A months ago, the PSU death and then a week after, my computer death also. Damn… Its Mean bad PSU will kill your Computer. So I got to buy new computer again, but now I buy PSU with 80+ certified. What is 80+ certified mean?
80 PLUS is an initiative to promote more electrical energy efficient computer power supply units (PSU). It certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. That is, PSUs that waste 20% or less electric energy as heat at the specified load levels, thus reducing electricity use and bills compared to less efficient PSUs. Sometimes rebates are given for manufacturers who use 80 plus-certified PSUs.
The efficiency of a computer power supply is the amount of energy it supplies, divided by how much energy is input. The remaining energy is converted into heat. For instance, a power supply operating at 60% efficiency, supplying 300 watts to a computer would draw 500 watts, and give off 200 watts of heat. An 80% efficient supply would draw 375 watts to produce the same 300 watts, giving off 75 watts of heat.
For a given power supply, efficiency varies depending on how much power is being delivered. Supplies are typically most efficient at between half and three quarters load, much less efficient at low load, and somewhat less efficient at maximum load. Older ATX power supplies were typically 60% to 75% efficient. To qualify for 80 PLUS, a power supply must achieve at least 80% efficiency at three specified loads (20%, 50% and 100% of maximum rated power). However, 80 PLUS supplies may still be less than 80% efficient at lower loads. For instance, an 80 PLUS, 520 watt supply could still be 70% or less efficient at 60 watts (a typical idle power for a desktop computer). Thus it is still important to select a supply with capacity appropriate to the device being powered.
Typical computer power supplies may have power factors as low as 0.5 to 0.6. The higher power factor reduces the peak current draw, reducing load on the circuit or on an uninterruptible power supply.
Reducing the heat output of the computer helps reduce noise, since fans do not have to spin as fast to cool the computer. Reduced heat and resulting lower cooling demands may increase computer reliability.
The testing conditions may give an unrealistic expectation of efficiency for heavily loaded, high power (rated much larger than 300W) supplies. A heavily loaded power supply and the computer it is powering generate significant amounts of heat, which may raise the power supply temperature, which is likely to decrease its efficiency. Since power supplies are certified at room temperature, this effect is not taken into account.
80PLUS does not set efficiency targets for very low load. For instance, generation of standby power may still be relatively inefficient, and may not meet requirements of the One Watt Initiative. Testing of 80 PLUS power supplies shows that they vary considerably in standby efficiency. Some consume half a watt or less in standby with no load, where others consume several times as much at standby, even though they may meet higher 80PLUS certification requirement levels. Inefficiencies in generating standby power are magnified by the amount of time that computers spend turned off.
That’s all about PSu with 80+ certified, hope this will help you to keep your computer alive longer! For more details about 80+ certified PSU you can visit 80+ Website
Source :Wikipedia
#1 by szybkie odchudzanie on June 15th, 2009
Interesujaca strona, napewno bede teraz wpadal tu czesciej, pozdrawiam