[section_title title=”Performance”]Performance

Since we don’t currently have access to an ATE load tester, a multi-meter is used to show each of the power supplies performance on the 3.3v, 5v and 12v rails.  Although we can’t do full load tests, we can provide relative information regarding variance and fluctuation of current and ripple on the rails which is integral and indicative of quality in a power supply.

To perform the above tests, the methodology will be as follows:

Test Setup

I7 4770k @ 4.8GHz

Gigabyte Z97 G1.Sniper

1 x Zotac GTX 780

8GB (2x4GB) Patriot Viper3 2400MHz CL10

1 x 250GB Samsung 840 EVO

be quiet! Straight Power E9 680w

Voltages will be monitored via a multi-meter and the AC power draw will be monitored via a power monitor when drew from the wall.  For the idle test, the system will be simply booted up and let to run into windows and after 5 minutes when the power draw has leveled out, the readings will be taken.

To load and apply power to the power supply, a combination of IBT and Furmark will be run to put as much strain on the power supply as possible.  After 10 minutes the readings will be taken and to ensure maximum strain, the CPU will be overclocked to 4.5GHz.  Depending on the power of the power supply, multiple graphics cards could be used in line with how comfortable I feel the power supply will cope with such load.

ATX themselves specify that a fluctuation and variable of 5% is acceptable so to number crunch it means that:

3.3V = 3.135V-3.465V is acceptable

5V = 4.75V-5.25V is acceptable

12V = 11.4V – 12.6V is acceptable.

Any readings outside of these figures will be an automatic fail.

Total idle power draw =124 w which equates to just over 18% so it should do spot on within the efficiency states with such a low load.

Total loaded power draw =581 w which equates to just over 85.4% so there plenty of load to test the power suppliers efficiency.  The results of the tests were as follows:

3.3V = 3.312v
5V = 5.124v
12V = 12.227v


3.3V = 3.339v
5V = 5.162v
12V = 12.160v


I was pleasantly surprised at the performance, especially on the main 12V line which has a maximum load rating of 660w alone; meaning you should never have an issue with power.  The performance on the 3.3V and 5V were more than ample too and it shows the quality of the components used in the Straight Power E9 range; remember that the power supply was loaded at over 85% of its rated peak power output.


Previous articleNvidia To Release The GTX880 As Soon As September?
Next articleAMD Announces Radeon R7 SSD's

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.