The Supermicro C9Z390-PGW Motherboard Review: The Z390 Board With PLX and 10GbE

Board Features

The C9Z390-PGW represents Supermicro's flagship entry onto the Z390 chipset. It also represents one of just two Z390 motherboards (one general consumers, one for workstations) to include a Broadcom PEX8747 PLX chip which allows users to use up to four PCIe 3.0 x16 slots. This is useful for users running mutliple PCIe accelerators with full bandwidth available. T

It's no secret that the Supermicro C9Z390-PGW motherboard is one of the most expensive Z390 motherboards on the market with a hefty price tag of $371 at Newegg. There's a host of high-quality features such as the included PLX chip, the Aquantia AQC107 10G NIC port and even the Intel 9560 Wi-Fi adapter which is one of the better ones currently available. There is plenty of USB 3.1 Gen2 connectivity with a total of nine available with up to seven Type-A and two Type-C supported; one of the Type-C is via a front panel header along with four Type-A. Storage capability is offered via two M.2 slots, two U.2 ports and six SATA ports.

Test Bed

As per our testing policy, we take a high-end CPU suitable for the motherboard that was released during the socket’s initial launch, and equip the system with a suitable amount of memory running at the processor maximum supported frequency. This is also typically run at JEDEC subtimings where possible. It is noted that some users are not keen on this policy, stating that sometimes the maximum supported frequency is quite low, or faster memory is available at a similar price, or that the JEDEC speeds can be prohibitive for performance. While these comments make sense, ultimately very few users apply memory profiles (either XMP or other) as they require interaction with the BIOS, and most users will fall back on JEDEC supported speeds - this includes home users as well as industry who might want to shave off a cent or two from the cost or stay within the margins set by the manufacturer. Where possible, we will extend out testing to include faster memory modules either at the same time as the review or a later date.

While we have been able to measure audio performance from previous Z370 motherboards, the task has been made even harder with the roll-out of the Z390 chipset and none of the boards tested so far has played ball. It seems all USB support for Windows 7 is now extinct so until we can find a reliable way of measuring audio performance on Windows 10 or until a workaround can be found, audio testing will have to be done at a later date.

Readers of our motherboard review section will have noted the trend in modern motherboards to implement a form of MultiCore Enhancement / Acceleration / Turbo (read our report here) on their motherboards. This does several things, including better benchmark results at stock settings (not entirely needed if overclocking is an end-user goal) at the expense of heat and temperature. It also gives, in essence, an automatic overclock which may be against what the user wants. Our testing methodology is ‘out-of-the-box’, with the latest public BIOS installed and XMP enabled, and thus subject to the whims of this feature. It is ultimately up to the motherboard manufacturer to take this risk – and manufacturers taking risks in the setup is something they do on every product (think C-state settings, USB priority, DPC Latency / monitoring priority, overriding memory sub-timings at JEDEC). Processor speed change is part of that risk, and ultimately if no overclocking is planned, some motherboards will affect how fast that shiny new processor goes and can be an important factor in the system build.

Hardware Providers for CPU and Motherboard Reviews
Sapphire RX 460 Nitro	MSI GTX 1080 Gaming X OC	Crucial MX200 + MX500 SSDs	Corsair AX860i + AX1200i PSUs
G.Skill RipjawsV, SniperX, FlareX	Crucial Ballistix DDR4	Silverstone Coolers	Silverstone Fans

New Test Suite: Spectre and Meltdown Hardened

For the start of our Z390 reviews, we are using an updated OS, updated drivers, and updated software. This is in line with our CPU testing updates, which includes Spectre and Meltdown patches.