Transient Response Tests
Advanced Transient Response Tests
For details on our transient response testing, please click here.
Ιn these tests, we monitor the PSU's response in two different scenarios. First, a transient load (10 A at +12V, 5 A at 5V, 5 A at 3.3V and 0.5 A at 5VSB) is applied for 200 ms while the PSU works at 20 percent load. In the second scenario, the PSU is hit by the same transient load while operating at 50 percent load. In both tests, we use our oscilloscope to measure the voltage drops caused by the transient load. The voltages should remain within the ATX specification's regulation limits.
These tests are crucial because they simulate the transient loads a PSU is likely to handle (such as booting a RAID array or an instant 100 percent load of CPU/GPUs). We call these tests "Advanced Transient Response Tests," and they are designed to be very tough to master, especially for a PSU with a capacity of less than 500 W.
Advanced Transient Response at 20 Percent
Advanced Transient Response at 50 Percent
The +12V rail performs poorly in these tests and the same goes for 3.3V. Only the 5V and 5VSB rails achieve decent performance.
Here are the oscilloscope screenshots we took during Advanced Transient Response Testing:
Transient Response At 20 Percent Load
Transient Response At 50 Percent Load
Turn-On Transient Tests
In the next set of tests, we measure the PSU's response in simpler transient load scenarios—during its power-on phase.
For the first measurement, we turn off the SX550, dial in the maximum current the 5VSB rail can output and switch the PSU on. In the second test, we dial the maximum load the +12V can handle and start the PSU while it's in standby mode. In the last test, while the SX550 is completely switched off (we cut the power or switch the PSU off by flipping its on/off switch), we dial in the maximum load the +12V rail can before switching the PSU on from the loader and restoring power. The ATX specification states that recorded spikes on all rails should not exceed 10 percent of their nominal values (+10 percent for 12 V is 13.2 V, and 5.5 V for 5 V).
The 5VSB slope is almost perfect. We don't have any complaints about the second test's results either (standby to full 12V). On the contrary, ripple is increased for a short period during the last test before the rail settles down to the nominal voltage level.
Also, according to your thing the PS113 doesn't support OTP, even though this unit seems to. It also seems to support UVP. Doesn't quite make sense to me. http://www.tomshardware.com/reviews/power-supplies-101,4193-22.html
how about Titan X Pascal cards / 1080 ti? They consume 435Watt total System power.
Also, my bad guys, I meant SF450 not 400.
maybe you should check the following cases :
Budget power supplies over 500W really have no place in this world. People purchase budget power supplies over 500W for three reasons:
1) They have high end hardware and underestimate the need for a quality PSU
2) They are uninformed and think "more watts" is better.
3) They overestimate their power requirements.
I suppose you could argue if they have 225W of hardware a 550W unit like this is perfect in terms of efficiency. Okay, maybe so. But that depends on how much you value efficiency, I suppose.
The unit still performs poorly compared to Corsair. It's true, Corsair SF dominate the SFX market with the best units.
Does not need to be 1080 ti , any 250 watt GPU card ... from 390 , 390x to others .. there are people on budget and use such cards in compact systems .
I just mentioned gtx 1080 ti as a modern example ..