Review Index:
Feedback

EVGA SuperNOVA 550GS and 650GS Gold PSU Review

Author: Lee Garbutt
Manufacturer: EVGA

DC Load Regulation and AC Ripple

DC Output Load Regulation

To simulate demanding and maximum loading conditions, the EVGA SuperNOVA 550 GS and 650 GS power supplies were 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.

View Full Size

SuperNOVA 550 GS:

SuperNOVA 550 GS: The following tables list the DC voltage results for the 550 GS PSU while operating on 115 VAC, 60 Hz.

View Full Size

The 550 GS produced very good voltage regulation on the three primary DC outputs with the measured values falling within the ±2% tight voltage regulation range that EVGA claims for their new GS units.

View Full Size

SuperNOVA 650 GS:

SuperNOVA 650 GS: The following tables list the DC voltage results for the 650 GS PSU while operating on 115 VAC, 60 Hz.

View Full Size

The 650 GS also produced very good voltage regulation on the three primary rails, again staying easily within the claimed tight voltage regulation parameters of ±2%.

View Full Size

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.

View Full Size

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.

SuperNOVA 550 GS:

View Full Size

The 550 GS power supply exhibited very good AC ripple suppression on all of the primary outputs, all the way up to full load. The +3.3V and +5V rails were extremely well behaved while the +12V output started to exhibit a little more ripple and noise than we have seen on some other high-end EVGA PSUs, but still stayed well below 50% of the recommended guidelines.

SuperNOVA 650 GS:

View Full Size

The results for the 650 GS power supply were nearly identical to the 550 GS.


March 24, 2015 | 01:56 PM - Posted by larsoncc

Do you know which Seasonic platform EVGA is using? XP2S? Do they compare to the Corsair AX series (I think that's the same platform, maybe not)? Are there any other supplies on the same platform for a compare/contrast?

March 25, 2015 | 01:34 PM - Posted by jonnyGURU (not verified)

These aren't XP series. These are a derivitive of the G Series.

March 25, 2015 | 10:45 AM - Posted by Bill (not verified)

Why not use the latest Power Supply Design Guide for Desktop Platform Form Factors, Revision 1.31, April 2013 (http://cache-www.intel.com/cd/00/00/52/37/523796_523796.pdf)? It calls for ENERGY STAR compliance, which are tighter than the 2.2 standard you use.

Note in Table 15, for 100%, 50% and 20% loads:
REQUIRED Minimum Efficiency 70% 72% 65%
RECOMMENDED Minimum Efficiency 82% 85% 82%

Post new comment

The content of this field is kept private and will not be shown publicly.
  • Lines and paragraphs break automatically.
  • Allowed HTML tags: <a> <em> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd> <blockquote><p><br>
  • Web page addresses and e-mail addresses turn into links automatically.

More information about formatting options

CAPTCHA
This question is for testing whether you are a human visitor and to prevent automated spam submissions.