Corsair HX620 620w Modular PSU


Load Testing

In order for the results from all current and future PSU reviews to remain fair and comparable, Overclock3D uses a custom built Power Supply load stress tester. The tester will be placing the following loads on each of the HX620's rails:

  Idle Load
+3.3v Rail
+5.0v Rail
+12v Rails
10a10a x3

As some power supplies produce obscure voltage outputs when running with 0% load, the Idle testing simulation will be produced by placing each rail under a small load similar to what would be expected from a mid-range PC. Load testing results are obtained by placing the unit under the maximum load selectable on the OC3D equipment without tripping the OLP (Over Load Protection) on the power supply.

Corsair HX620 +3.3v Corsair HX620 +5.0v

Corsair HX620 +12v

Both the +3.3v and +5.0v rails remained well within ATX specifications throughout the testing, with the +5v rail exhibiting the most droop at 0.07v - still a very respectable result for any PSU placed under heavy load.

During the +12v load testing, each of Corsair's three rails (rated at 18amps) were placed under a total load of 30 amps. As a result of this, each rail produced the same voltage output results across the board and therefore only necessitated a single graph as shown above. With a maximum voltage fluctuation of 0.02v, the HX620 shows that it is more than capable of producing stable power to any medium/high-end SLI or Crossfire setup.

Efficiency Testing

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester. These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.

Corsair HX620 Efficiency Idle Corsair HX620 Efficiency Load

At idle the HX620 was placed under a total load of 203 watts with a recording of 253 watts consumption being obtained from the mains. Therefore the efficiency of the HX620 at idle worked out to be 80.2%.

Increasing the load on the unit produced even more favourable results, with the HX620 managing 83.8% efficiency when being placed under a total load of 646 watts.

Noise Testing

Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.

For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.

Idle Recording - Download
Load Recording - Download

At idle the HX620 was extremely quiet with the 120mm fan running at a very low RPM. As the load on the unit was increased, the fan gradually gained speed in order to counteract the extra heat produced by the PSU's components. Even at full load the HX620 managed to keep a good balance between the noise and heat output of the unit, proving that Seasonic's implimentation of a 60mm fan on their M12 PSU was not necessarily required.

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Most Recent Comments

27-11-2006, 10:05:17

Had a quick flick though. Another good job Mr XMS.

Seems very pricy to me though.Quote

27-11-2006, 10:19:56

Mr. Popo
oO0o... very nice!


27-11-2006, 11:10:28

Originally Posted by name='Mr. Popo'
Read the review, its in there.Quote

27-11-2006, 11:24:35

Mr. Popo
Originally Posted by name='Ham'
Read the review, its in there.
I've read it twice, nothing...

Can I see a quote?Quote

27-11-2006, 11:28:06

Originally Posted by Mr. Popo
I've read it twice, nothing...

Can I see a quote?
"For a ~600w unit the sum of £96 (over at may seem a little higher than most other competing products, however as the saying goes - "You get what you pay for", and this is certainly true for the HX620."


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