The NZXT N7 Z490 Motherboard Review: From A Different Direction
by Gavin Bonshor on October 7, 2020 10:30 AM EST- Posted in
- Motherboards
- Intel
- ASRock
- NZXT
- Z490
- Comet Lake
- Intel 10th Gen
- i7-10700K
- N7 Z490
Power Delivery Thermal Analysis
A lot more focus has been put onto power delivery specifications and capabilities, not just by manufacturers, but as a result of users demands. In addition to the extra power benefits from things like overclocking, more efficient designs in power deliveries and cooling solutions aim to bring temperatures down. Although this isn't something most users ever need to worry about, certain enthusiasts are bringing more focus onto each board's power delivery. The more premium models tend to include bigger and higher-grade power deliveries, with bigger and more intricate heatsink designs, with some even providing water blocks.
The 8+2+1 power delivery on the NZXT N7 Z490
Testing Methodology
Our method of testing out if the power delivery and its heatsink are effective at dissipating heat, is by running an intensely heavy CPU workload for a prolonged method of time. We apply an overclock which is deemed safe and at the maximum that the silicon on our testbed processor allows. We then run the Prime95 with AVX2 enabled under a torture test for an hour at the maximum stable overclock we can which puts insane pressure on the processor. We collect our data via three different methods which include the following:
- Taking a thermal image from a birds-eye view after an hour with a Flir Pro thermal imaging camera
- Securing two probes on to the rear of the PCB, right underneath CPU VCore section of the power delivery for better parity in case a probe reports a faulty reading
- Taking a reading of the VRM temperature from the sensor reading within the HWInfo monitoring application
The reason for using three different methods is that some sensors can read inaccurate temperatures, which can give very erratic results for users looking to gauge whether an overclock is too much pressure for the power delivery handle. With using a probe on the rear, it can also show the efficiency of the power stages and heatsinks as a wide margin between the probe and sensor temperature can show that the heatsink is dissipating heat and that the design is working, or that the internal sensor is massively wrong. To ensure our probe was accurate before testing, I binned 10 and selected the most accurate (within 1c of the actual temperature) for better parity in our testing.
To recreate a real-world testing scenario, the system is built into a conventional desktop chassis which is widely available. This is to show and alleviate issues when testing on open testbeds which we have done previously, which allows natural airflow to flow over the power delivery heatsinks. It provides a better comparison for the end-user and allows us to mitigate issues where heatsinks have been designed with airflow in mind, and those that have not. The idea of a heatsink is to allow effective dissipation of heat and not act as an insulator, with much more focus from consumers over the last couple of years on power delivery componentry and performance than in previous years.
NZXT N7 Z490 undergoing our VRM thermal testing (we close the side panel when testing)
For thermal image, we use a Flir One camera as it gives a good indication of where the heat is generated around the socket area, as some designs use different configurations and an evenly spread power delivery with good components will usually generate less heat. Manufacturers who use inefficient heatsinks and cheap out on power delivery components should run hotter than those who have invested. Of course, a $700 flagship motherboard is likely to outperform a cheaper $100 model under the same testing conditions, but it is still worth testing to see which vendors are doing things correctly.
Thermal Analysis Results
We measured 60.6°C on the hottest part of the PCB which was around the CPU socket
The NZXT N7 Z490 is using a 10-phase design for the power delivery, which is being controlled by an Intersil ISL69269 PWM controller. It is operating in an 8+2 configuration, with eight Vishay SiC632A 50 A power stages for the CPU VCore, and two Vishay SiC632A 50 A power stages for the SoC.
It is cooled by a decent-sized L-shaped heatsink, and although it doesn't use a fin array, it has a hollowed-out channel to help direct airflow through this to keep it cool.
Focusing on the power delivery thermals, the NZXT N7 Z490 doesn't do a bad job, with the board's integrated sensor reporting a maximum temperature of 61°C. This was similar to the readings we got from our pair of K-type thermal probes with temperature readouts of 62 and 61°C respectively.
Compared to other boards we have tested so far, it runs quite warm for an ATX sized model, but it is still well within the rated specifications, which is clearly a plus. The design of the heatsink could be better, but NZXT appears to have focused solely on aesthetics as opposed to raw performance.
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Gigaplex - Wednesday, October 7, 2020 - link
Can we please stop calling these stupid shrouds that trap heat "armor"?stephenbrooks - Thursday, October 8, 2020 - link
When I saw this I was hoping it was all metal and the components all had heatsinks bonded to it (so it acts as a huge heat sink), but obviously not...s.yu - Thursday, October 8, 2020 - link
All plastic would be thoroughly disappointing.AlexTopfer - Wednesday, October 7, 2020 - link
What does this 'armour' do? And why do you need to armour a motherboard, wouldn't you armour the case?Or is it designed to protect against spalling inside an armoured cases?
Can you please test the armour too? What caliber will it protect against?
Tomatotech - Friday, October 9, 2020 - link
It’s for looks. Just like tacti-cool.My PCs are little black or silver ITX boxes, but if I was building an art piece I’d be tempted to use something like this if I wasn’t going for the cables everywhere junk-punk style.
wolfman3k5 - Thursday, October 8, 2020 - link
They're mediocre junk. Gigabyte, ASUS or MSI, even EVGA, they all make decent motherboards. NZXT should stick to cases, LEDs and AIOs.selenite - Thursday, October 8, 2020 - link
The motherboard, including SSDs is covered in metal and plastic, restricting the airflow to the board's surface, PCH heatsink and SSDs/SSD heatsinks. VRM heatsinks, hollowed out to improve the airflow, but no actual fan that would send some air into what appears to be an L-shaped duct. All of this prettiness is inside the case.A hideous cutout for the USB-C connector at the back. That one is outside the case.
¯\_(ツ)_/¯
Tomatotech - Friday, October 9, 2020 - link
Ouch that C cutout is terrible. It looks like it might be for some kind of locking USB-C connector but I can’t find anything that would fit it. Hopefully they will fix it in a revision.I have an ancient cheap gigabyte ITX mobo with an i3-6100 in it that has a perfectly formed usb c connector & cutout in the backboard. It isn’t hard.
nunya112 - Thursday, October 8, 2020 - link
Asrock will probably blacklist you for not being 100% positive in this review. Just wanted to let you know :)hanselltc - Thursday, October 8, 2020 - link
Wrong platform, wrong time, and definitely the wrong feature set -- at least when you only count the working features.