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:
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
Cooler Master VSM 750w
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 16.5% 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 77% so there plenty of load to test the power suppliers efficiency. The results of the tests were as follows:
|3.3V = 3.421v|
|5V = 5.071v|
|12V = 12.13v|
|3.3V = 3.353v|
|5V = 5.18v|
|12V = 12.194v|
The fluctuation on all the lines was nothing but sublime and soon as load was placed, it ramped up and literally stuck to the results you can see above; I wouldn’t expect anything less from an Enhance OEM. The voltages were also well within the rated voltages set by ATX and I have no concerns whatsoever regarding quality or performance.