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Gigabyte AORUS GP-AP850GM PSU Review

Advanced Transient Response Tests

For details on our transient response testing, please click here.

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 “Advanced Transient Response Tests” and they are designed to be very tough to master, especially for a PSU with a capacity of less than 500W.

In all of the tests, we use an oscilloscope to measure the voltage drops caused by the transient load. The voltages should remain within the ATX specification’s regulation limits.

We should note here that the ATX spec requires for capacitive loading during the transient rests, but in our methodology we chose to apply the worst case scenario with no extra capacitance on the rails.

Advanced Transient Response at 20 Percent – 200ms

Voltage Before After Change Pass/Fail
12V 12.255V 12.174V 0.66% Pass
5V 5.074V 5.019V 1.08% Pass
3.3V 3.390V 3.317V 2.15% Pass
5VSB 5.100V 5.065V 0.69% Pass

Advanced Transient Response at 20 Percent – 20ms

Voltage Before After Change Pass/Fail
12V 12.253V 12.122V 1.07% Pass
5V 5.073V 5.015V 1.14% Pass
3.3V 3.390V 3.296V 2.77% Pass
5VSB 5.100V 5.063V 0.73% Pass

Advanced Transient Response at 20 Percent – 1ms

Voltage Before After Change Pass/Fail
12V 12.252V 12.143V 0.89% Pass
5V 5.072V 5.007V 1.28% Pass
3.3V 3.388V 3.304V 2.48% Pass
5VSB 5.100V 5.062V 0.75% Pass

Advanced Transient Response at 50 Percent – 200ms

Voltage Before After Change Pass/Fail
12V 12.234V 12.175V 0.48% Pass
5V 5.053V 5.001V 1.03% Pass
3.3V 3.374V 3.302V 2.13% Pass
5VSB 5.063V 5.027V 0.71% Pass

Advanced Transient Response at 50 Percent – 20ms

Voltage Before After Change Pass/Fail
12V 12.234V 12.150V 0.69% Pass
5V 5.052V 4.985V 1.33% Pass
3.3V 3.372V 3.281V 2.70% Pass
5VSB 5.063V 5.013V 0.99% Pass

Advanced Transient Response at 50 Percent – 1ms

Voltage Before After Change Pass/Fail
12V 12.232V 12.144V 0.72% Pass
5V 5.051V 4.998V 1.05% Pass
3.3V 3.372V 3.285V 2.58% Pass
5VSB 5.063V 5.024V 0.77% Pass

 

The Aorus unit offers very good transient response on all rails. MEIC delivered a highly capable platform to Gigabyte, given the results so far.

Here are the oscilloscope screenshots we took during Advanced Transient Response Testing:

Transient Response At 20 Percent Load – 200ms

Transient Response At 20 Percent Load – 20ms

Transient Response At 20 Percent Load – 1ms

Transient Response At 50 Percent Load – 200ms

Transient Response At 50 Percent Load – 20ms

Transient Response At 50 Percent Load – 1ms

Turn-On Transient Tests

In the next set of tests, we measure the GP-AP850GM’s response in simpler transient load scenarios—during its power-on phase.

For our first measurement, we turn the GP-AP850GM off, dial in the maximum current the 5VSB rail can handle, and switch the PSU back on.

In the second test, we dial the maximum load the +12V rail can handle and start the PSU while it is in standby mode. In the last test, while the PSU is completely switched off (we cut off the power or switch the PSU off through its power switch), we dial the maximum load the +12V rail can handle before restoring power. The ATX specification states that recorded spikes on all rails should not exceed 10 percent of their nominal values (+10 percent for 12V is 13.2V, and 5.5 V for 5V).

 

Almost perfect results here, A small period with increased ripple during the last test spoiled a bit the overall great picture, however this is nothing to worry about since there are no spikes or notable overshoots at +12V.

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