Load Testing
For those of you that are curious as to some of the reasoning and equipment behind our PSU testing program here at TheFPSReview, we have put together an introduction for you. This program is based on what the author developed at [H]ardOCP and utilizes the equipment bequeathed to the author by Kyle Bennett. The testing we are conducting today is exactly as described in that document and start with our 120v, 100v, Torture, and 80 Plus Tests.
120v and 100v Load Testing Results
Test #1 is equal to approximately 25% of the rated capacity of the ASUS ROG STRIX 750W at 45c. This makes Test #1 equal to 185W by loading the 12v rail to 13a, the 5v rail to 2a, the 3.3v rail to 1a, the +5vsb to 2a, and the -12v to 0.3a. The results of Test #1 show the main positive DC output rails starting above nominal. The efficiency for this unit is starting off in excellent shape at a value of 91.49% at 120v AC input and 90.15% at 100v AC input. We see the exhaust temperature is 47C at 120v AC input and 49C at 100V AC input.
Test #2 is equal to approximately 50% of the rated capacity of the ASUS ROG STRIX 750W at 45c. This makes Test #2 equal to 368W by loading the 12v rail to 27a, the 5v rail to 4a, the 3.3v rail to 2a, the +5vsb to 2a, and the -12v to 0.3a. Test #2 sees mixed results in the DC output voltages relative to what we saw with Test #1. The largest changes are up to a 0.02v increase on the 12v rail followed by a 0.01v drop on the 5v and 3.3v rails. The efficiency has moved down to 91.38% at 120v AC input and up to 90.26% at 100v AC input. We see an exhaust temperature of 50C at 120v AC input and 52C at 100V AC input.
Test #3 is equal to approximately 75% of the rated capacity of ASUS ROG STRIX 750W at 45c. This makes Test #3 equal to 575W by loading the 12v rail to 42a, the 5v rail to 7a, the 3.3v rail to 5a, the +5vsb to 2a, and the -12v to 0.3a. Test #3 sees the 5v and 3.3v rails drop by 0.01v and 0.02v respectively. The 12v rail is mixed with some connectors seeing an increase of 0.01v and others a decrease of up to 0.02v. The efficiency in Test #3 moves down to 89.44% at 120v AC input and up to 88.21% at 100v AC input. We see an exhaust temperature of 54C at 120v AC input and 59C at 100V AC input.
Test #4 is equal to approximately 100% of the rated capacity of the ASUS ROG STRIX 750W at 45c. This makes Test #4 equal to 757W by loading the 12v rail to 60a, the 5v rail to 2a, the 3.3v rail to 1a, the +5vsb to 2a, and the -12v to 0.3a. In the final regular test, we see the 12v rail move up by up to 0.02v. The minor rails, however, see a small decrease of 0.01v on the 5v rail or no change at all on the 3.3v rail. The efficiency has dropped as we see it come in at 87.56% at 120v AC input and 85.87% at 100v AC input. We see an exhaust temperature of 57C at 120v AC input and 60C at 100V AC input.
Torture Test
The Torture Test is equal to approximately 80% of the rated capacity of the ASUS ROG STRIX 750W at 45C. This makes the Torture Test equal to 605W by loading the 12v rail to 44a, the 5v rail to 8a, the 3.3v rail to 6a, the +5vsb to 2a, and the -12v to 0.3a. At the end of the Torture Test, the ROG STRIX 750W is still doing well. The DC output voltages are generally in line with what we have been seeing in the 120v load tests. The efficiency is excellent as we see a value of 88.671% and the exhaust temperature is 65C.
80 Plus Load Testing Results
As we see here, the ASUS ROG STRIX 750W posts efficiency values of 86.34%-91.13%-91.40% efficient using 80 Plus’ load testing parameters. This puts the unit right under the 80 Plus Gold standards by 0.66% in the 20% load test. However, we do use different equipment than 80 Plus for our testing and there is always a bit of component variation.
Load Testing Summary
The ASUS ROG STRIX 750W did an excellent job in our initial load testing! When we look at the voltage regulation, we see that the ROG STRIX 750W had peak changes of 0.05v on the 12v rail, 0.03v on the 5v rail, and 0.03v on the 3.3v rail. These absolute values are easily in specification and absolutely excellent overall. In relative terms, these results are better than what we saw with the Phanteks AMP 750 and mixed with EVGA SuperNOVA G5 750W which is, of course, impressive.
When we look at the efficiency values posted today, we see that the ROG STRIX 750W ranged from 87.56% to 91.49% efficient at 120v AC input and 85.87% to 90.26% efficient at 100v AC input. Also, this unit posted values in our 80 Plus Test that were just barely under the 80 Plus Gold level that it is certified for at 20% load. Lastly, the exhaust temperature peaked at 57C at 120v AC input, 60C at 100v AC input, and 65C during the Torture Test. With excellent starting results in today’s testing, let’s move on to the Transient Load Tests to see what this unit will do there!