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What is the importance of 80+ certification - Page 2

post #11 of 26
The 80+ certification refers to the efficiency of the PSU. Let's say you have a 1kw PSU with 80% certification. That means in order for the PSU to provide 1000w for the system, it must draw ~1200w from the wall. With 90% certification, the PSU would have to draw 1100w from the wall to provide 1000w to the system, and so forth with different wattage ratings and various certification levels.

The certification has nothing to do with the quality of parts, but usually with higher certification, higher quality parts are often used, but not always.
     
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post #12 of 26
As stated, it's simply a note of efficiency and has little to no bearing on quality.

Most cheap PSUs will net you around ~70% efficiency.
Something like 80+ Gold is rated to be at least 90% efficient at half load for a 115v input.

If you were to compare two of these units in a 24/7 scenario with a 100w DC load at $0.15/kWh, we can see the following:
70% : 100 / .70 = ~142.86 watts from the wall
90% : 100 / .90 = ~111.11 watts from the wall

A difference of 31.75w. We can calculate the difference over a year by converting to kilowatt hours and multiplying by the rate.

31.75w/1000w = .03175 kW * 24h = 0.762 kWh/day * 365d = 278.13 kWh/year * $0.15 = ~$41.72/year that the 90% PSU will save you over the 70% PSU.

Quote:
Originally Posted by Chaython View Post

So do u think none 80+ certified rosewil psu will be good

I'd suggest researching exact models and asking questions on here.
Based on the response it looks like you're just out for whatever is cheap enough to get by.

I'd recommend revisiting that mentality.
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post #13 of 26
Quote:
Originally Posted by DuckieHo View Post

Yup. 80+ has NOTHING to do with quality.
Here's the testing guidelines: http://efficientpowersupplies.epri.com/pages/Latest_Protocol/Generalized_Internal_Power_Supply_Efficiency_Test_Protocol_R6.6.pdf
The tests are ran at only 23°C+/-5°C.
Rosewill has a few good models... but why limit yourself? What's your requirement and budget?
That's not true....
1) OklahomaWolf has beening doing most of the reviews for the last few years.
2) They don't have time for all PSUs nor do they get all units for review.
3 There are other good PSU review sites.

1) Either way a non biased review gets done.

2) Ofcourse they don't, but for the majority of PSU's OCN use you can find a review on.

3) I know, but could spend ages Ctrl C and V links to the OP when all I need is one.

I respect your opinion however.
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post #14 of 26
80 plus is good to have. Saves electricity, and reduces heat in the power supply which saves the components stress. Generally, units that aren't 80 plus also don't have Active PFC and they use cheaper parts like fast recovery diodes with high voltage drops, undersized low end transformers, inadequate Mosfet's on the primary side. It's a double negative because these PSU's normally have low end capacitors and they end up bulging very quickly because of the extra heat. At least for your main rig I wouldn't use anything that isn't 80 plus.
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post #15 of 26
Efficiency in anything is always related to thermodynamics. The remaining percentage is heat, even in mechanical systems... Yeah, it DOES take quality components and design to hit these high levels of efficiency, so don't take these ignorant statements about "efficiency doesn't mean quality" to heart.
 
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post #17 of 26
Quote:
Originally Posted by ramicio View Post

Efficiency in anything is always related to thermodynamics. The remaining percentage is heat, even in mechanical systems... Yeah, it DOES take quality components and design to hit these high levels of efficiency, so don't take these ignorant statements about "efficiency doesn't mean quality" to heart.

This is true, although companies can still overrate their units. They could have a solid 400W 80 Plus Bronze power supply but when they throw a 650W label on there, and you're paying the price for a 650W unit, it just becomes a waste of money. Companies like Raidmax also have some units that say they're 80 Plus but really aren't
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post #18 of 26
Quote:
Originally Posted by ramicio View Post

Efficiency in anything is always related to thermodynamics. The remaining percentage is heat, even in mechanical systems... Yeah, it DOES take quality components and design to hit these high levels of efficiency, so don't take these ignorant statements about "efficiency doesn't mean quality" to heart.

What's "quality components and design" really mean?

If, for example, you look at the 80 plus gold FSP Aurum and derivatives (Be Quiet! Pure Power E9, Antec Earthwatts Platinum), you might call it a "good" design in that it does its purpose—relatively high efficiency for relatively low cost. But the performance is not good, just the efficiency. There are a whole bunch of sub-80 plus gold designs that are way better than these. There are also a whole bunch of sub-80 plus gold designs better than OCZ Z Series, and there are plenty of other examples.

The overall topology, switching frequency, components, and so on... all are related to performance and efficiency, and they are not necessarily positively correlated. DC-DC generation of minor rails has both performance and good efficiency. Use higher-quality silicon with lower Rds(on), and you get better efficiency, maybe better performance too. But not everything is like that. If you use less filtering components, you will get higher efficiency and lower performance, for example. If you use LLC resonant primary, you can get higher efficiency than traditional two-transistor forward, but voltage regulation in response to quickly-changing loads (sharp transient, jump in power draw) is usually worse as a result.



Anyway, as for the OP...
Quote:
Originally Posted by Chaython View Post

I understand it is more efficient but please define tome how? and does it have better real world efficiency? is this just to save the power bill or does it improve the wattage capabilities to the pc
As covered by others, the efficiency is the ratio of AC power drawn from the wall to DC power delivered to the computer. That's a real-world figure.

That efficiency depends on the load, the temperature (slightly), the power supply design (meaning the electrical circuit, topology, and so on), and the power supply components.

The performance of the power supply, how stable and clean all the outputs are, how reliable it is, and so on—these all depend on the load, the temperature, the power supply design, and power supply components as well. As explained above, the factors contributing to high efficiency do not necessarily contribute to high performance, and vice versa.

Some of the correlation between efficiency and performance comes from the pricing and expectations of consumers, so a sales rather than engineering concern. The buyers expect the expensive power supplies to both be efficient and to perform well, so most designs aiming for high efficiency also aim for higher performance. Correspondingly, the price tags on these are higher. Antec tried a high-performance, middling efficiency, high price line in their Signature series, and sales were terrible. Now they sell Earthwatts Platinums (but also some high-performance, high-efficiency, high-price stuff, of course).
Edited by mikeaj - 10/11/12 at 11:28am
post #19 of 26
What are you looking for, something that spits out 1,000 watts, or something appropriately sized for your application? Of course something of high performance is going to automatically equal quality, but just because something of lower performance doesn't meet its specs., that doesn't mean the actual device or is low quality, just the measuring done to come up with those numbers. To have these insanely high efficiencies automatically means quality.
 
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post #20 of 26
Quote:
Originally Posted by ramicio View Post

What are you looking for, something that spits out 1,000 watts, or something appropriately sized for your application? Of course something of high performance is going to automatically equal quality, but just because something of lower performance doesn't meet its specs., that doesn't mean the actual device or is low quality, just the measuring done to come up with those numbers. To have these insanely high efficiencies automatically means quality.
[emph added]

No it doesn't, unless by "quality" you're just talking about efficiency. See above.

I mean, it probably doesn't matter so much either way, but don't pretend like there aren't real tradeoffs here. High-efficiency designs of mediocre quality do exist, and there could be more if the market demanded.
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