Transient 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 that shares a lot of the behind-the-scenes of the program. 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 will continue with our Transient Testing.
Transient Test 1
12v Loaded/5v Loaded/5v Unloaded
12v/5v
Test #1 is equal to approximately 25% of the rated capacity of the Lian Li SP750 at 45c. This makes Test #1 equal to 183W 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 before the addition of the transient load. The results of Test #1 show a ~400mV drop on the 12v rail and ~20mV drop on the 5v rail when each is directly loaded. At the same time that the load was being triggered on the 12v rail, the 5v rail measured a ~20mV drop.
Transient Test 2
12v Loaded/5v Loaded/5v Unloaded
12v/5v
Test #2 is equal to approximately 50% of the rated capacity of the Lian Li SP750 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 before the addition of the transient load. The results of Test #2 show a ~400mV drop on the 12v rail and ~20mV drop on the 5v rail when each is directly loaded. At the same time that the load was being triggered on the 12v rail, the 5v rail measured a ~20mV drop.
Transient Load Testing Summary
The Transient Load Tests results for the Lian Li SP750 are passing and a mix of good to excellent. In today’s testing, the SP750 saw the loaded 12v rail post a peak change of ~400mV, and the loaded 5v rail post a peak change of ~20mV. The unloaded 5v peak change during the 12v load was ~20mV. Those numbers are, in an absolute sense, excellent for the 5v rail and then just good for the 12v rail. In a relative sense, the 5v rail matches what we saw from the SilverStone SX750 but it trails the results we saw from it on the 12v rail. That said, when we consider that this unit is an SFX product, these look a bit better than we would expect sill. Let’s move on now to see how this unit does in the DC Output Quality aspect of our testing!