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Be Quiet! Pure Power L8 700W Power Supply Review

Manufacturer: Be Quiet!

DC Load Regulation and AC Ripple

DC Output Load Regulation

To simulate real world and maximum loading conditions, the Pure Power L8 700W PSU was connected to the load testers and supplied with a constant 115 VAC.  In this test we are interested in seeing how well a PSU can maintain the various output voltages while operating under different loads. 

The ATX12V V2.2 tolerance for voltages states how much each output (rail) is allowed to fluctuate and has tighter tolerances now for the +12V outputs.  I have also included a second table of expanded tolerances (±1% to ±6%) for reference.

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The following tables list the DC voltage results for the PSU while operating on 115 VAC, 60 Hz.

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As you can see, the Pure Power L8 700W PSU produced excellent load regulation on all of the outputs across a broad range of loads. Delivering ±2% regulation on the main DC outputs is excellent, especially for a budget oriented PSU.    

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AC Ripple and Noise on the DC Outputs

The amount of AC ripple and noise present on the DC outputs was checked using a digital oscilloscope.  This AC component may be present in the KHz range where most switching power supplies operate or it may be more prevalent at the 60 Hz line frequency.  We adjust the O-scope time base to look for AC ripple at both low and high frequencies.  The ATX12V V2.2 specification for DC output noise/ripple is defined in the ATX12V Power Supply Design Guide.

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Ideally we would like to see no AC ripple (repetitive) or noise (random) on the DC outputs – the cleaner the better!  But in reality there will always be some present.  I measured the amplitude of the AC signal (in millivolts, peak-to-peak) to see how well the power supply complied with the ATX standard.  The following table lists the ripple/noise results during all of the load tests for the main output voltages of interest.

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The AC ripple and noise suppression results for the Pure Power L8 700W PSU were fair but not as good as we typically see on high-end units. While higher than we would like to see, all of the measurements stayed well below the recommended guidelines.
 

October 1, 2013 | 07:41 AM - Posted by Anonymous (not verified)

Is it MADE in Germany too ?
If it is...I want !

October 6, 2013 | 07:54 AM - Posted by Anonymous (not verified)

No.
they use rebranded or made-by units from FSP and seasonic.
Buy either seasonic or get the XFX pro black FM/Lepa G series.
Both are made by seasonic, but cheaper AND better than most beQuiets.

October 1, 2013 | 07:51 AM - Posted by Anonymous (not verified)

Only one place..in City Of Industry...carries them...and ALL models are out of stock !
What good is that ?

October 1, 2013 | 07:56 AM - Posted by Anonymous (not verified)

I meant local...COI not far for me...Newegg has 1000Watt Gold for $259.99 !
http://www.newegg.com/Product/Product.aspx?Item=N82E16817222005

October 1, 2013 | 09:21 AM - Posted by Anonymous (not verified)

Great review, great product, I know what my next power supply will be!

October 6, 2013 | 07:56 AM - Posted by Anonymous (not verified)

they use rebranded units from FSP and seasonic.

Buy either seasonic or the XFX pro black FM/Lepa G series.

Both are made by seasonic, but cheaper.
AND better than most beQuiets.

March 10, 2014 | 10:22 PM - Posted by Anonymous (not verified)

Read the article:

"Be Quiet! appears to be using the HEC Group as the OEM for the Pure Power L8 700W power supply (instead of Seasonic who is the OEM for the Dark Power Pro 10 we reviewed earlier this year"

Spouting opinions as fact - stupid dickhead

October 8, 2013 | 03:16 PM - Posted by Löwenchen (not verified)

Well bought it anyway it'll come in a few days. As long as it makes clean power and is silent it's fine by me so we shall see!

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