Page 1:Brought To You By Granny’s Radio
Page 2:How A Switching Power Supply Works
Page 3:Efficiency, Efficiency, Efficiency!
Page 4:Of Power Factors, Apparent Power And Effective Power
Page 5:How To Spot An Efficient PSU?
Page 6:Don't Get Burned: Safety Before Stinginess
Page 7:Reliability Above All: Caps And Fan
Page 8:How To Determine Your Power Requirements
Page 9:The Power Window Is Important
Page 10:Example 1: The Office PC
Page 11:Example 2: Mid-Range Gaming PC
Page 12:Example 3: The Enthusiast’s System
Page 13:If You Don't Like Our Advice, Buy A Fire Extinguisher
Example 1: The Office PC
Test Case 1: Office PC
Here’s a look at our standard office PC.
Our goal is to find a suitable power supply for it. We’ll have to ask your forgiveness here, as this article originated with our German team. While some of the power supplies used by our colleagues may not be available in the U.S., they still serve to illustrate the point quite well.
Also, we were hoping to use Huntkey’s Jumper 300W 80 PLUS Gold as our standard. Sadly, the review sample we were promised got stuck somewhere between China and German customs and didn’t make it to the lab in time. That’s why Super Flower's 450W Golden Green is taking its place, despite being a bit on the beefy side for what we need. So, without further ado, here are our candidates:
|Hardwaremania24||Standard ATX 420W||None||$14 (€9.90)|
|LC-Power||LC6350 Super Silent 350W||None||$28 (€19.90)|
|be quiet!||Pure PowerL7 300W||80 PLUS||$45 (€32.00)|
|Rasurbo||Real & Power RAP 350W||80 PLUS||$49 (€35.00)|
|Super Flower||Golden Green 450W||80 PLUS Gold||$83 (€59.00)|
Big Charts For Our Smallest System
Now for the big reveal. How do our various contenders stack up? Well, have a look for yourself. There are certainly some pronounced differences:
Nineteen watts separate the best and worst power supplies at idle, with be quiet! and Rasurbo taking the top spots. The Gold-certified Super Flower model places third, with the two cheapest PSUs landing last.
That ranking doesn’t change much when we look at a normal usage scenario, where the difference between first and last place shrinks to 11W. However, Rasurbo and be quiet! trade places, while the rest of the field stays unchanged.
Under load, the delta between our top performer and the worst offender increases to 14W, with Super Flower's submission taking the lead ahead of Rasurbo and be quiet!. Meanwhile, the super-cheap Hardwaremania24 PSU's efficiency curve starts to fall off again, exposing the component as a rebadged 250W model. If you want to try for 300W using a sub-par piece of hardware like that, keep a fire extinguisher handy.
In all three scenarios, the 80 PLUS-certified models take the top spots. Interestingly, the Gold-rated Super Flower PSU only takes first under a full load. As such, its higher price doesn't really seem worthwhile. Then again, it does get penalized somewhat by being the highest-capacity model in this group. Super Flower's big advantage is a semi-passive cooling mode. Under these loads, the fans don't spin up at all, making the Golden Green 450 W an interesting choice for quiet PCs.
- Brought To You By Granny’s Radio
- How A Switching Power Supply Works
- Efficiency, Efficiency, Efficiency!
- Of Power Factors, Apparent Power And Effective Power
- How To Spot An Efficient PSU?
- Don't Get Burned: Safety Before Stinginess
- Reliability Above All: Caps And Fan
- How To Determine Your Power Requirements
- The Power Window Is Important
- Example 1: The Office PC
- Example 2: Mid-Range Gaming PC
- Example 3: The Enthusiast’s System
- If You Don't Like Our Advice, Buy A Fire Extinguisher