Gigabyte Aorus Z390 I Pro WIFI Review: Mini-ITX Z390 Tested

Right, so here's the thing about motherboards that most people don't think about until it's too late: your CPU is only as good as the board it sits on. I've watched people drop serious money on a Core i9 and then stick it on a board with VRMs that can barely handle sustained load without throttling. The CPU ends up performing like something two tiers down. That's not a hypothetical. I've seen it happen in my own workshop more times than I'd like to admit. Which is exactly why I don't just read spec sheets and call it a review. I actually build with these things, run them hard, and see what happens.

The Aorus Z390 I Pro WIFI is a Mini-ITX board targeting people who want a serious small-form-factor build without compromising on features. And that's a genuinely tricky brief. Cramming Z390 functionality, decent VRMs, WiFi, and a usable rear I/O into a 17cm x 17cm PCB is no small feat. Gigabyte's Aorus sub-brand has been pushing into the enthusiast space for a while now, and this board sits at the premium end of the Mini-ITX Z390 market. But premium pricing doesn't automatically mean premium execution, so I spent several weeks putting this through its paces in a proper small-form-factor build to find out whether it actually delivers.

I tested it with a Core i7-9700K, which is a reasonable real-world pairing for this board. Not the most extreme chip you could throw at it, but a proper 95W TDP processor that gives the VRMs something to work with. I also ran some stress tests with a borrowed i9-9900K to see how the board handles the upper end of what it's designed for. The results were... instructive. More on that shortly.

The spec sheet looks good on paper, but what I always want to know is how those specs translate to actual usability. Two M.2 slots on a Mini-ITX board is something I genuinely appreciate because most small boards make you choose between fast storage and having a second drive. The SATA port count is also better than some full-size B360 boards I've reviewed, which tells you something about how Gigabyte has prioritised the layout here. The rear I/O is dense but well-organised, and the inclusion of a USB Type-C port on the back panel is something that was still fairly noteworthy when this board launched.

One thing worth flagging upfront: this is a 2018-era board, and the second-hand market is where most people will encounter it now. The Z390 platform is mature and well-understood, which is actually a point in its favour if you're building a budget-conscious SFF system around ninth-gen Intel hardware. Prices have come down considerably from launch, and at current used pricing it represents a very different value proposition than it did at release. Keep that in mind as we go through the review.

Is that a problem? Honestly, it depends on what you're building. If you're putting together a secondary machine, a home server, or a compact gaming rig on a tight budget using second-hand ninth-gen parts, then no, it's not a problem at all. The i7-9700K and i9-9900K are still genuinely capable processors for gaming and general workloads. The i9-9900K in particular was Intel's flagship for a good while and still holds up respectably in gaming benchmarks. The platform is well-understood, drivers are stable, and you're not going to hit any nasty surprises.

One thing to be aware of: if you're buying this board new or second-hand and pairing it with a ninth-gen CPU, you shouldn't need a BIOS update before the CPU will POST. Ninth-gen support was baked into Z390 from launch. But if you somehow ended up with a very early BIOS revision and an eighth-gen chip, you'd want to check Gigabyte's support page before assuming everything will just work. In practice, any board that's been sitting on a shelf for a few years will have had its BIOS updated at some point, so this is more of a theoretical concern than a practical one for most buyers.

The Z390 chipset natively supports up to six SATA 6Gb/s ports, up to 10 USB 3.1 Gen 1 ports, and up to six USB 3.1 Gen 2 ports. Obviously a Mini-ITX board can't expose all of those, but the point is that Gigabyte had plenty of chipset bandwidth to work with when designing the I/O layout. The four SATA ports and the USB allocation on this board are chipset-native, which means you're not relying on third-party controllers for basic connectivity. That matters for reliability and driver stability, particularly on a platform this mature.

Overclocking support is the other big Z390 advantage. The chipset allows full CPU multiplier adjustment and memory overclocking beyond the standard DDR4-2666 spec. If you're pairing this board with a K-series processor (which you probably should be, given you're paying for Z390), you have access to all the usual overclocking tools. Whether the VRMs can actually sustain an aggressive overclock is a separate question, and one I'll get into properly in the next section. But the chipset itself isn't the limiting factor here.

The Aorus Z390 I Pro WIFI uses a 6+2 phase power design. That's six phases for the CPU Vcore and two for the integrated graphics/system agent. The MOSFETs are International Rectifier (now Infineon) components, which are decent quality parts. The heatsink coverage is reasonable for a Mini-ITX board, though it's obviously not going to match what you'd find on a full-size Z390 board with a proper chunky heatsink assembly. During my testing with the i7-9700K at stock settings, VRM temperatures stayed sensible. Under extended Prime95 stress testing (the kind of load you'd never actually see in real-world use, but useful for stress testing), temperatures climbed but didn't hit anything alarming.

Where it gets more interesting is with the i9-9900K. That chip has a 95W TDP officially, but under real-world all-core loads it can pull significantly more than that, particularly if you're running with power limits removed. I ran the 9900K at stock with Intel's default power limits in place, and the board handled it without complaint. But if you're the type who likes to remove power limits and let the chip boost freely, you'll want to keep an eye on VRM temperatures in a compact case with limited airflow. The board isn't going to catch fire, but sustained all-core loads with a 9900K and no power limits in a poorly ventilated case is pushing what this VRM setup is really designed for. For the 9700K and below, or for the 9900K with sensible power limits, you're absolutely fine.

In practice, I tested with a 16GB (2x8GB) DDR4-3200 kit running XMP, and it posted and ran stably without any fiddling required. That's the experience most people will have with a mainstream XMP kit in the DDR4-3000 to DDR4-3600 range. If you're trying to push past DDR4-4000, you're into proper memory overclocking territory where you'll need to manually tune timings and voltages, and results will vary. The JEDEC DDR4 standard specifies up to DDR4-3200 for the official spec, so anything above that is technically overclocking regardless of what the XMP label says.

One thing I noticed during testing: the board is reasonably tolerant of memory kits that aren't on its official QVL (Qualified Vendor List). I tried a couple of kits that weren't listed and they ran fine at their rated XMP speeds. That's not always the case with Mini-ITX boards, which can sometimes be fussier about memory compatibility than their full-size counterparts due to the shorter trace lengths and different signal integrity characteristics. The Z390 memory controller is generally well-regarded for compatibility, and this board seems to benefit from that. Max capacity of 64GB requires 32GB DIMMs, which are available but cost more per gigabyte than 16GB sticks. For most people, 32GB (2x16GB) is the sweet spot.

The four SATA 6Gb/s ports are a bonus on top of that. In a Mini-ITX case you're often limited to two or three drive bays anyway, so four SATA ports is more than enough. There's one caveat worth knowing: when you populate the M2M slot (the underside one) with a SATA M.2 drive, it shares bandwidth with two of the SATA ports, which get disabled. This is a chipset lane-sharing limitation, not a Gigabyte-specific design choice, and it's common across Z390 boards. If you're running NVMe drives in both M.2 slots, all four SATA ports remain active. Just something to be aware of when planning your storage layout.

RAID support is present via Intel's RST (Rapid Storage Technology) for both SATA and M.2 configurations. Honestly, RAID on a desktop board is something most home users never touch, but it's there if you need it. The more relevant point for most buyers is that the NVMe performance from the M.2 slots is full PCIe 3.0 x4, so you're not being bottlenecked by the board when running a fast NVMe drive. I tested with a Samsung 970 EVO in the primary slot and got expected sequential read/write numbers without any issues.

The reinforced slot is something I actually appreciate on a Mini-ITX board specifically. In compact cases, the GPU is often sitting at an awkward angle relative to the case structure, and there's more mechanical stress on the PCIe slot than you'd typically see in a mid-tower. The reinforcement isn't just marketing fluff in this context. It's a practical benefit. I've seen unreinforced slots develop hairline cracks on Mini-ITX boards after a year or two of use in cases where the GPU is particularly heavy or where the build has been moved around a lot.

Beyond the GPU slot, there's an M.2 slot on the top of the board that could theoretically be used for an M.2 WiFi card, but given that WiFi is already built in via the Intel Wireless-AC 9560 module, that's not a use case you'd ever actually need. The PCIe 3.0 specification from PCI-SIG provides up to 8 GT/s per lane, giving the x16 slot a theoretical bandwidth of 16 GB/s, which is more than sufficient for any GPU available at the time this platform was current and for most use cases even today.

The USB Type-C on the rear panel was a genuine differentiator when this board launched. A lot of competing Mini-ITX boards at the time were still sticking to Type-A only on the rear, so having a Gen 2 Type-C port there is useful if you're connecting modern peripherals or external storage. The USB Implementers Forum specifies USB 3.1 Gen 2 at up to 10 Gbps, which is fast enough for most external SSD use cases. The two USB 2.0 ports are there for keyboards, mice, and dongles, which is fine. Nobody needs USB 3.1 Gen 2 for a wireless mouse receiver.

Internal headers are where the board's Mini-ITX constraints show up more clearly. You get one USB 3.1 Gen 1 internal header, one USB 2.0 header, and a single USB 3.1 Gen 2 Type-C internal header. Fan headers are limited to four (CPU fan, CPU optional, system fan, and system fan optional), which is enough for most SFF builds but won't satisfy anyone trying to run a complex fan array. There's no Clear CMOS button on the rear I/O, which is a minor annoyance if you're doing memory overclocking and need to reset the BIOS regularly. You'll need to use the onboard jumper instead, which is fiddly in a compact case.

The wireless side uses Intel's Wireless-AC 9560 module, which supports 802.11ac (Wi-Fi 5) with 2x2 MU-MIMO and Bluetooth 5.0. The Wi-Fi Alliance's 802.11ac specification supports theoretical speeds up to 1.73 Gbps on the 5GHz band with the right router, though real-world performance is always lower. In practice, the 9560 is a solid performer for its generation. It's not Wi-Fi 6 or Wi-Fi 6E, which is the obvious limitation here, but for a board from 2018 it was a reasonable choice and it still works fine for everyday use.

Bluetooth 5.0 is genuinely useful and holds up well. I used it throughout my testing period for wireless headphones and a Bluetooth keyboard without any pairing issues or dropouts. The antenna connectors on the rear I/O accept standard SMA-type antennas, and the board ships with two antennas in the box. They're not the most elegant things in the world, but they do the job. If you're building into a case with internal antenna routing, you can swap them out for internal antennas without any issues.

Fan control is handled through the Smart Fan 5 system, which gives you per-header control with temperature source selection. You can tie each fan header to a different temperature sensor (CPU, PCH, or system), set custom curves, and choose between PWM and DC control modes. This is the kind of fan control that used to be a premium feature and is now table stakes, but it's implemented well here. I set up a custom curve for my CPU cooler during testing and it worked exactly as configured without any weird behaviour. The temperature monitoring is accurate and updates in real time within the BIOS, which sounds basic but some BIOS implementations are genuinely terrible at this.

Overclocking options are comprehensive for a Z390 board. You get full CPU multiplier and base clock control, per-core multiplier adjustment, LLC (Load Line Calibration) settings, and detailed voltage controls. Memory overclocking is similarly well-featured, with XMP profile loading working reliably and manual timing adjustment available for those who want to go deeper. I ran the i7-9700K at 5.0 GHz all-core during testing, which required bumping the Vcore and adjusting LLC. The board handled it without drama, though as I mentioned earlier, VRM temperatures in a compact case are worth monitoring if you're pushing a high-voltage overclock. One genuine gripe: the BIOS update process via Q-Flash is fine, but there's no BIOS Flashback button on the rear I/O, which means you need a working system to update the BIOS. Not ideal.

PCB quality feels solid. The board has a good weight to it for its size, and the component placement is well thought out. The M.2 slot on the underside of the board is covered by a thermal pad and a metal backplate that doubles as a heatsink, which is a nice touch. The primary M.2 slot on the top of the board doesn't have a dedicated heatsink cover, which is a minor omission, but most M.2 NVMe drives don't run hot enough to need one in a well-ventilated case. The SATA ports are right-angled, which is the correct choice for a Mini-ITX board where cable management is always a challenge.

The heatsink on the VRM area is a single aluminium piece that covers the power delivery components. It's adequate for the VRM design, though it's obviously not going to match the chunky dual-heatsink assemblies you see on full-size Z390 boards. The overall build quality impression is positive. This doesn't feel like a board where Gigabyte cut corners on materials to hit a price point. The PCIe slot reinforcement, the backplate on the underside M.2, and the general component quality all suggest a product that was designed to last. Whether it actually does last is something only time will tell, but the physical build inspires confidence.

The ASRock Z390 Phantom Gaming-ITX/ac is the closest competitor in terms of feature set. It also has two M.2 slots, Intel WiFi, and a similar VRM configuration. The ASRock board has a slight edge in VRM thermal performance due to its heatsink design, but the Gigabyte board has better rear I/O with the USB Type-C port. The BIOS on the ASRock is decent but I personally find Gigabyte's UEFI slightly more intuitive for day-to-day use, though that's subjective. The ASRock also lacks the RGB lighting, which will matter to some people and not at all to others.

The ASUS ROG Strix Z390-I Gaming is the premium option in this comparison. It has a more elaborate VRM setup, better heatsink coverage, and ASUS's excellent BIOS (which I'll grudgingly admit is one of the better UEFI implementations in the industry). It also costs noticeably more, even on the used market. If you're planning to run a 9900K with power limits removed and you want the absolute best Mini-ITX Z390 board for sustained overclocking, the ROG Strix is the one to get. But if you're running a 9700K or a 9600K, or a 9900K with sensible power limits, the Gigabyte board is a more cost-effective choice that doesn't leave meaningful performance on the table.

The underside M.2 slot is the one fiddly bit. To access it, you need to remove the backplate, which involves taking the board out of the case. This is a Mini-ITX reality rather than a Gigabyte-specific problem, but it does mean you want to decide on your storage configuration before the board goes into the case. I learned this the hard way during testing when I decided to add a second NVMe drive after the initial build was complete. Twenty minutes of unnecessary disassembly followed. Plan your storage before you build.

Cable management in a Mini-ITX case is always a challenge regardless of the board, but the right-angled SATA connectors and the sensible header placement on this board make it as painless as it can be. The board also has good clearance around the CPU socket area, which matters for cooler compatibility. I used a Noctua NH-L9i during testing, which fit without any issues and left enough clearance for the RAM slots. Taller coolers will obviously depend on your case's height limit, but the board itself doesn't create any unusual clearance problems.

The criticisms that come up repeatedly are worth taking seriously. VRM temperatures under heavy sustained load in compact cases is the most common concern, particularly from users running 9900K chips. This aligns with what I found in testing. It's not a dealbreaker, but it's a real consideration. A few users have also reported that the board can be fussy about memory compatibility with certain kits outside the QVL, though my own experience was more positive. The lack of a BIOS Flashback feature is mentioned occasionally, particularly by users who've had to recover from a bad BIOS update.

Long-term reliability reports are generally positive. Users who've been running this board for several years report no significant issues, which is ultimately the most important metric. A board that works flawlessly for five years is worth more than one with slightly better benchmark numbers that develops capacitor issues at the three-year mark. The Aorus Z390 I Pro WIFI seems to be holding up well in long-term use, which is reassuring given that most people buying it now are doing so for a multi-year build.

On the current used market, the value equation looks quite different. Z390 boards have dropped significantly in price as the platform has aged, and this board now sits in a price bracket where it represents genuinely good value for a Mini-ITX Z390 build. You're getting a feature set that was considered premium at launch, at a price that's now in mid-range territory. The main competition at similar used prices is the ASRock Z390 Phantom Gaming-ITX/ac, and the choice between them really comes down to whether you prioritise the Gigabyte's USB Type-C rear port and RGB or the ASRock's slightly better VRM thermal performance.

The broader value question is whether Z390 as a platform is worth investing in at all in 2024 or 2025. And honestly, that depends entirely on your situation. If you already have ninth-gen Intel hardware and you're looking for a Mini-ITX board to build around it, this is a solid choice. If you're starting from scratch and buying a CPU as well, you'd want to seriously consider whether a more current platform makes more sense for the long term. The Z390 platform is mature and stable, but it's a dead end in terms of CPU upgrades. That's the honest assessment.

• VRM thermals need monitoring with 9900K and no power limits in compact cases
• No BIOS Flashback makes BIOS recovery more painful than it needs to be
• Wi-Fi 5 only, no Wi-Fi 6 or 6E (though this is a platform-era limitation)
• Underside M.2 requires board removal to access, plan storage before building
• Dead-end platform, no CPU upgrade path beyond ninth-gen Intel
• No Clear CMOS button on the rear I/O

Who should buy this? Someone building a compact gaming or workstation PC around a ninth-gen Intel processor, particularly if they already have the CPU and are looking for a quality Mini-ITX board to build around it. It's also a good choice for a home theatre PC or a compact secondary machine where the small footprint matters and you want WiFi built in. The feature set is genuinely strong for the price on the used market, and the long-term reliability track record is reassuring.

Who should skip it? Anyone starting a fresh build from scratch in 2024 or 2025 who doesn't already have ninth-gen Intel hardware. The platform is a dead end, and you'd be better served by a current-generation platform with a longer upgrade path. Also, if you're planning to run a 9900K or 9900KS with all power limits removed in a very compact case with minimal airflow, the ASUS ROG Strix Z390-I Gaming's more capable VRM setup is worth the extra cost. And if you absolutely need Wi-Fi 6, this board won't give you that. But for the right buyer, the Aorus Z390 I Pro WIFI is a proper bit of kit that does what it says on the tin. I'd score it around 8 out of 10 for what it is: a feature-rich Mini-ITX Z390 board that mostly delivers on its promises, with the VRM thermal caveat being the main asterisk.

If you're not committed to Mini-ITX and just want a good Z390 board at a sensible price, the used market for full-size Z390 boards is full of options with better VRM setups and more expansion slots. The Gigabyte Z390 Aorus Pro (full ATX) and the MSI Z390 Gaming Edge AC are both worth looking at if you have the case space. You lose the compact form factor but gain headroom for more demanding CPU configurations.

And if you're genuinely open to a different platform entirely, it's worth considering whether a current-generation Intel or AMD platform makes more sense for your situation. The Intel LGA1700 platform (12th through 14th gen) and AMD's AM5 platform both offer significantly longer upgrade paths than Z390. If you're buying a CPU as well as a board, the extra cost of a current platform is often justified by the upgrade flexibility you get in return. The Z390 platform is excellent for what it is, but "what it is" is a mature, closed ecosystem. Go in with eyes open.

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