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.

Power Consumption

Power consumption was tested on the system while in a single MSI GTX 770 Lightning GPU configuration with a wall meter connected to the OCZ 1250W power supply. This power supply is Gold rated, and as I am in the UK on a 230-240 V supply, leads to ~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 770)

Power OS Idle (w/GTX 770)

Power OCCT (w/GTX 770)

As a low cost motherboard, there are two ways a power reading can be interpreted. If it’s low, then due to the lack of controllers compared to the high end motherboards, this is to be expected. If high, then the power delivery might be a budget implementation with reduced efficiency. For the MSI Z170A SLI PLUS, we got an impressive 73W delta from long idle to load in our test, with the load power being the lowest we’ve seen on a Z170 motherboard so far.


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 7 starts loading. (We discount Windows loading as it is highly variable given Windows specific features.) 


For whatever reason, when Z170 was launched there was a regression in POST times from most motherboard manufacturers. DDR4 training does take longer than DDR3 used to, but instead of sub 10-seconds being a good target, for Z170 anything under 15-seconds is good to see. The SLI PLUS floats on the 16 second boundary here, with not much change when the BIOS is stripped and controllers disabled.

Rightmark Audio Analyzer 6.2.5

Rightmark:AA indicates how well the sound system is built and isolated from electrical interference (either internally or externally). For this test we connect the Line Out to the Line In using a short six inch 3.5mm to 3.5mm high-quality jack, turn the OS speaker volume to 100%, and run the Rightmark default test suite at 192 kHz, 24-bit. The OS is tuned to 192 kHz/24-bit input and output, and the Line-In volume is adjusted until we have the best RMAA value in the mini-pretest. We look specifically at the Dynamic Range of the audio codec used on board, as well as the Total Harmonic Distortion + Noise.

Rightmark Audio Analyzer 6.2.5: Dynamic Range

Rightmark Audio Analyzer 6.2.5: THD+N

We noted earlier in the review that for a low-cost motherboard, MSI still implemented the Realtek ALC1150 codec with a few modifications like PCB separation and filter caps, but not the big modifications we see on more expensive products. The ALC1150 still performs reasonablt well on SNR, although THD+N isn’t the best we’ve seen.

USB Backup

For this benchmark, we transfer a set size of files from the SSD to the USB drive using DiskBench, which monitors the time taken to transfer. The files transferred are a 1.52 GB set of 2867 files across 320 folders – 95% of these files are small typical website files, and the rest (90% of the size) are small 30 second HD videos. In an update to pre-Z87 testing, we also run MaxCPU to load up one of the threads during the test which improves general performance up to 15% by causing all the internal pathways to run at full speed.

Due to the introduction of USB 3.1, as of June 2015 we are adjusting our test to use a dual mSATA USB 3.1 Type-C device which should be capable of saturating both USB 3.0 and USB 3.1 connections. We still use the same data set as before, but now use the new device. Results are shown as seconds taken to complete the data transfer.

USB Copy Test, 2867 Files (1.52GB)

Unfortunately, due to the USB Type-C on the motherboard and my lack of a cable that isn’t cat-chewed, we were only able to run USB 3.0 results in time for the review. This came in at 5.7 seconds, a nice medium between the two collections at 5.6 and 5.8.

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

Similarly to POST times, DPC Latency seems to either be quite good or rather bad on the current crop of Z170 motherboards. The SLI PLUS is better than most, hovering just above 110 microseconds at its peak.

Software CPU Performance, Short Form
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  • thetuna - Wednesday, April 13, 2016 - link

    Your data for the Gigabyte UD5 is very wrong (I own it).
    It has 4 dimm slots, 0x u.2, 1x m.2, and the pcie slots do either 16+4 or 8+8+4.
    Idk what else is wrong there...
  • DanNeely - Wednesday, April 13, 2016 - link

    It looks like it's pulling data for a different board entirely. The shopping link is for an Asus mITX board; that appears to have the specs shown here.
  • Gunbuster - Wednesday, April 13, 2016 - link

    Somewhere a warehouse slightly less full of overstocked PS/2 ports is happy.
  • hansmuff - Wednesday, April 13, 2016 - link

    I like my PS/2 ports, NKRO is a given and hardware interrupts > software interrupts.
  • Ikepuska - Wednesday, April 13, 2016 - link

    I really applaud MSI for this board. It's a great price point for a compelling product.
    Unfortunately I'm going to be sitting skylake out it looks like. I'm waiting to see what the kaby lake refresh might bring in terms of motherboards because U.2 is really really hard to find in a 170 series for a sane price.
    The honest truth is that I hope for fewer SATA ports and no SATA Express ports in kaby. Because of the longevity of the cpu performance nowadays I really want 2 or more U.2 ports, ideally one M.2 port for a boot drive. I'd be willing to give up all or almost all sata ports for such a mythical board. (Not that a board with no sata ports would ever sell yet.)
  • dreamcat4 - Wednesday, April 13, 2016 - link

    > I'm waiting to see what the kaby lake refresh might bring in terms of motherboards because U.2 is really really hard to find in a 170 series for a sane price.

    Well I can understand people wanting to wait for Kaby Lake now. SInce its so near. However lack of U.2 ports isn't really one of them. For one thing, very few products are coming out with U.2. Making it next-to-useless.

    Secondly, there do already exist very simple m.2 --> U.2 adapters. So with one of those, then any cheap Z170 mobo with an x4 m.2 slot should work fine. In fact mine has 2 of them, and its not even classed as a mid-range board. (Gigabyte Z170X Gaming 3). And using m.2 --> U.2 adapter is the more flexible solution. Since for some reason theres no adaptors available on the market which can go the other way around.
  • jasonelmore - Wednesday, April 13, 2016 - link

    F Kaby Lake, we all waiting for Skylake EP
  • Ikepuska - Wednesday, April 13, 2016 - link

    While I agree that U.2 is nascent, I still had a functioning 2009 board as of this year in use. The truth of the matter is that people still have Sandy and Ivy systems as their main gaming rig. So while yes, there are adapters and add-in cards that would serve the purpose of providing U.2 connectivity, I'd rather have the right ports available and grow into them so to speak. Since I'm looking at keeping the next platform I build for about 8 years or so.
  • Manch - Thursday, April 14, 2016 - link

    Wouldn't use this as my main rig board but a media center mid range gaming pc for the living room this would fit the bill nicely.
  • kaesden - Wednesday, April 13, 2016 - link

    Had this board been out a few months ago, i'd probably have gone with this over my Asus board and saved a hundred bucks.

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