System Performance

Not all motherboards are created equal. On the face of it, they should all perform the same and differ only in the functionality they provide - however, this is not the case. The obvious pointers are power consumption, but also the ability for the manufacturer to optimize USB speed, audio quality (based on audio codec), POST time and latency. This can come down to manufacturing process and prowess, so these are tested.

For Z390 we are running an updated version of our test suite, including OS and CPU cooler. This has some effect on our results.

Power Consumption

Power consumption was tested on the system while in a single ASUS GTX 980 GPU configuration with a wall meter connected to the Thermaltake 1200W power supply. This power supply has ~75% efficiency > 50W, and 90%+ efficiency at 250W, suitable for both idle and multi-GPU loading. This method of power reading allows us to compare the power management of the UEFI and the board to supply components with power under load, and includes typical PSU losses due to efficiency. These are the real world values that consumers may expect from a typical system (minus the monitor) using this motherboard.

While this method for power measurement may not be ideal, and you feel these numbers are not representative due to the high wattage power supply being used (we use the same PSU to remain consistent over a series of reviews, and the fact that some boards on our test bed get tested with three or four high powered GPUs), the important point to take away is the relationship between the numbers. These boards are all under the same conditions, and thus the differences between them should be easy to spot.

Power: Long Idle (w/ GTX 980)Power: OS Idle (w/ GTX 980)Power: Prime95 Blend (w/ GTX 980)

Looking at the power charts above, the GIGABYTE Z390 Aorus Master performs superbly in comparison to other boards in the same price bracket such as the MSI MEG Z390 ACE. The power consumption performance in both long idle and idle states are middle of the road, but at full load is where the Z390 Aorus Master really shows us its efficiency in our testing.


Different motherboards have different POST sequences before an operating system is initialized. A lot of this is dependent on the board itself, and POST boot time is determined by the controllers on board (and the sequence of how those extras are organized). As part of our testing, we look at the POST Boot Time using a stopwatch. This is the time from pressing the ON button on the computer to when Windows starts loading. (We discount Windows loading as it is highly variable given Windows specific features.)


In our non-UEFI POST time test, the Z390 Aorus Master actually performs a little better than the above graph shows. In our testing, we usually discount the Windows loading time during POST. The Z390 Aorus Master completely bypassed this procedure and went straight from POST into Windows. For fair testing, the result as normal was taken, but in reality, it's a little quicker than the graph suggests which would shoot it further up the table. The crux is, the Z390 Aorus Master has a fast POST.

DPC Latency

Deferred Procedure Call latency is a way in which Windows handles interrupt servicing. In order to wait for a processor to acknowledge the request, the system will queue all interrupt requests by priority. Critical interrupts will be handled as soon as possible, whereas lesser priority requests such as audio will be further down the line. If the audio device requires data, it will have to wait until the request is processed before the buffer is filled.

If the device drivers of higher priority components in a system are poorly implemented, this can cause delays in request scheduling and process time. This can lead to an empty audio buffer and characteristic audible pauses, pops and clicks. The DPC latency checker measures how much time is taken processing DPCs from driver invocation. The lower the value will result in better audio transfer at smaller buffer sizes. Results are measured in microseconds.

Deferred Procedure Call Latency

None of the boards tested so far has had optimizations for DPC latency out of the box and while some boards do appear to perform better than others at default, the Z390 Aorus Master misses the mark from a lot of other models on test.

Board Features, Test Bed and Setup CPU Performance, Short Form
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  • El Sama - Thursday, March 21, 2019 - link

    Comes with a solid VRM, unlike Asus fake Phases VRM.
  • TelstarTOS - Thursday, March 21, 2019 - link

  • gavbon - Thursday, March 21, 2019 - link

    It's a solid power delivery; nothing wrong with using doublers and GIGABYTE are very clear in their marketing too. I wish all the vendors followed this practice!
  • sonny73n - Friday, March 22, 2019 - link

    I went to Gigabyte website for this board and saw that they claim it’s a true 12 phase VRM.

    But Anandtech says “the GIGABYTE Z390 Aorus Master is highly competitive with its power delivery design (doubled six-phase)”.

    So Gigabyte bullshit AGAIN. I hope your wish won’t come true.
  • iohlighi - Monday, March 25, 2019 - link

    There's a difference between using doublers, which are additional components to split a phase into two phases, and just adding two of each component to a single phase which is what people are referring to with asus here. With doublers, they are indeed out of phase with each other as needed to be considered a phase. The downside of doublers vs dedicated phases without doublers is there is no load/temp balancing between the two doubled phases because the controller sees it as just one.
  • JlHADJOE - Wednesday, March 27, 2019 - link

    A properly doubled 6-phase *is* a true 12-phase.

    If the output of the PWM is A B C D E F, then a Gigabyte puts a doubler on each PWM output, and an output stages on each of the doubler's outputs, so the final result becomes something like A1 A2 B1 B2 C1 C2 D1 D2 E1 E2 F1 F2. Each sub-phase is a proper time slice.

    ASUS on the other hand is sneaky and simply wired two output stages to each of the PWM's four output channels on their boards, so A B C D from the PWM simply becomes AA BB CC DD.
  • sonny73n - Friday, March 22, 2019 - link

    I’ve seen more fake phases VRM from Gigabyte than any others. Even tho Gigabyte claims this board has 12 true phases, I wouldn’t believe them. And sure Gigabyte boards can OC to 5Ghz but core voltage would be 1.5v, temp will be more than 100C and crash as soon as your game loads.

    Go to Newegg for buyers’ reviews. Gigabyte customer service as well as OCing ability are horrible.
  • sonny73n - Friday, March 22, 2019 - link

    Sorry not all Gigabyte boards are as bad as I said. It’s only about 90% of them and this is not silicone lottery.
  • JlHADJOE - Wednesday, March 27, 2019 - link

    Gigabyte's Z390 Aorus line is legit (unlike their previous Z370 series). Buildzoid took a very in-depth look at this board and the VRMs get his seal of approval.

    Linked timestamp is at start of VRM analysis
  • shaolin95 - Thursday, April 4, 2019 - link

    nonsense...talking BS without actually researching. Go cry home Asus fanboy

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