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.
Normal and Short Cable Length 120v Load Testing Results
Test #1 is equal to approximately 25% of the rated capacity of the Corsair RM750x (2018) 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 off right around nominal. However, we are measuring a 0.01v difference between cables sets on the 5v rail, 0.02v on the 3.3v rail, and up to a 0.02v difference on the 12v rail. The efficiency for this unit is starting off at a value of 89.75% with the normal cables and 89.78% with the short cables.
Test #2 is equal to approximately 50% of the rated capacity of the Corsair RM750x (2018) at 45c. This makes Test #2 equal to ~326W by loading the 12v rail to 24a, the 5v rail to 3a, the 3.3v rail to 2a, the +5vsb to 2a, and the -12v to 0.3a. Test #2 sees across the board declines in DC output voltages relative to what we saw with Test #1. The changes do vary between cable set, however. With the normal cables, the 12v rail drops by up to 0.04v, the 5v rail drops by 0.02, and the 3.3v rail drops by 0.02v. With the short cables, the 12v rail drops by up to 0.02v, the 5v rail drops by 0.01, and the 3.3v rail drops by 0.01v. The efficiency comes in at 90.87% with the normal cables and 91.26% with the short cables.
Test #3 is equal to approximately 75% of the rated capacity of Corsair RM750x (2018) at 45c. This makes Test #3 equal to~578W by loading the 12v rail to 43a, the 5v rail to 6a, the 3.3v rail to 4a, the +5vsb to 2a, and the -12v to 0.3a. Test #3 sees across the board declines in the main DC output voltages and the changes vary between cable set. With the normal cables, the 12v rail drops by up to 0.06v, the 5v rail drops by 0.01, and the 3.3v rail drops by 0.02v. With the short cables, the 12v rail drops by up to 0.06v, the 5v rail drops by 0.01, and the 3.3v rail drops by 0.01v. The efficiency comes in at 88.68% with the normal cables and 89.86% with the short cables.
Test #4 is equal to approximately 100% of the rated capacity of the Corsair RM750x (2018) at 45c. This makes Test #4 equal to ~752W 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 mixed results in the main DC output voltages and the changes vary between cable set. With the normal cables, the 12v rail drops by up to 0.04v, the 5v rail stays even, and the 3.3v rail rises by 0.02v. With the short cables, the 12v rail drops by up to 0.05v, the 5v rail rises by 0.01, and the 3.3v rail stays even. The efficiency comes in at 87.12% with the normal cables and 87.65% with the short cables.
Torture Test
The Torture Test is equal to approximately 80% of the rated capacity of the Corsair RM750x (2018) at 45C. This makes the Torture Test equal to 597W by loading the 12v rail to 44a, the 5v rail to 7a, the 3.3v rail to 5a, the +5vsb to 2a, and the -12v to 0.3a. At the end of the Torture Test, the DC output voltages are generally in line with what we have been seeing in the 120v load tests. Relative to one another, the 12v rail on the normal cables is recording a value equal to or trailing the short cables. The 5v rails coming in equal to one another and the 3.3v rail is coming in a good bit higher on the short cable set than on the normal cable set The efficiency comes in at 90.40% with the normal cables and 91.64% with the short cables.
Load Testing Summary
Today, we see measurable differences in the voltage regulation and efficiency from our test Corsair RM750x (2018) depending on which cable set we are using. When we look at the voltage regulation, we see that the RM750x (2018) had peak changes of 0.14v on the 12v rail, 0.03v on the 5v rail, and 0.04v on the 3.3v rail using the normal length cables. When using the short cables, we saw voltage regulation of up to 0.1v on the 12v rail, 0.02v on the 5v rail, and 0.02v on the 3.3v rail and when we look at the efficiency of this unit, with the two cables sets, we again see measurable differences. Using the normal length cables, we saw efficiency values of 87.12% to 90.87% and with the short cables efficiency values of 87.65% to 91.26%. So, much like the voltage regulation, the efficiency values we see today do vary to some degree between these cable sets. Let’s move on to some final thoughts about this exercise.