More widely known for its server-grade models, Supermicro always launches a small number of consumer motherboards, sometimes with some extra flair and hardware we don't see from the regular vendors. This time around, Supermicro's top-tier C9Z490-PGW uses a PLX chip which enables the board to operate with dual PCIe 3.0 x16 or quadruple PCIe 3.0 x8 slots. This is combined with dual PCIe 3.0 x4 M.2 slots from the chipset, a 10 gigabit Ethernet controller, and a Wi-Fi 6 interface which makes the C9Z490-PGW versatile for a wide array of users. 

Supermicro C9Z490-PGW Overview

Supermicro is one of the most recognizable brands in the server and workstation market. Still, as we saw in our review of the C9Z390-PGW, Supermicro is consistently injecting its 'server' grade DNA into its desktop models. The difference between Z390 and Z490 isn't as stark as it could be, with the main attribute coming in the way of networking support, with an integrated Wi-Fi 6 MAC, which allows users to utilize CNVi modules. For Intel's launch of the 10th generation Comet Lake processors, Supermicro unveiled a pair of Z490 models, the C9Z490-PG and C9Z490-PGW, with the only difference being that the PGW comes with a Wi-Fi 6 interface, while the PG does not.

The Supermicro C9Z490-PGW is one of the most unique Z490 models for several reasons, with a combination of unique and server inspired aesthetics, as well as an interestingly premium feature set. It represents its SuperO series of motherboards, which offers server-grade quality and a standard consumer-focused model. Touching briefly on the design of the C9Z490-PGW, it uses a blend of black and silvers to create a classy two-tone theme, with solid black aluminum power delivery heatsinks and SuperO metal reinforcement on both the PCIe and memory slots. The C9Z490-PGW drops integrated RGB LED lighting and RGB headers and doesn't play on the lack of RGB support as a marketable feature like some vendors do.

Obviously the big feature is the PLX switch, enabling 32 PCIe 3.0 lanes on this motherboard. The use of PLX switches on mainstream motherboards was rife in the time of the Z77 platform, however it has fallen by the wayside, mostly due to the increased cost as the company that used to make these switches was acquired, and the price was risen to a more consumer-unfriendly price point. With this switch, the board can support two add-in cards at a full x16/x16, or four cards at x8/x8/x8/x8, all at PCIe 3.0 speeds (because Comet Lake is PCIe 3.0 and this switch is PCIe 3.0 only). This opens up a number of avenues for users wanting to enable, for example, a Comet Lake-based storage system with RAID cards. To get this many lanes would otherwise require a different platform, usually in the high-end desktop space, or a Xeon. On top of the PCIe lanes, there are also dual PCIe 3.0 x4 M.2 slots, with four available SATA ports supporting RAID 0, 1, 5, and 10 arrays and networking through a 10 gigabit Ethernet controller, Wi-Fi 6 with additional support for BT 5.1 devices. It also includes a premium onboard HD audio codec, with lots of USB support onboard, including a stacked rear panel and plenty of USB headers located around the edge of the PCB. It also has a modest level of memory support, with capability for DDR4-4000, with a capacity for up to 128 GB.

In our performance testing, we saw the expected levels we would associate with a board that is running Intel's default power settings. Supermicro boards often run at strict Intel defaults, whereas consumer motherboards are more liberal with Intel's suggestions for power limits and turbo levels. If this is taken into account, the C9Z490-PGW performed competitively, especially against the ASUS ROG Maximus XII Hero WiFi when comparing it when running without ASUS's enhancements. These had no real impact on gaming performance, but it performed slightly lower than other Z490 models, some of which have mult-core enhancement features enabled by default. Our system tests showed that power consumption is noticeably higher than other models on test, predictably down to the PLX chip. It also has longer POST times than other Z490 models, which is a common theme for Supermicro boards due to a focus on professional-level elements. Out of the box, default DPC latency performance wasn't too great, but it is still an acceptable score.


The Supermicro C9Z490-PGW undergoing thermal VRM testing

Overclocking with the C9Z490-PGW wasn't as straight forward as first would seem. It uses a competent 8+2 phase power delivery, but the firmware is restricting the capabilities. The only way to see a noticeable uplift in performance is to manually adjust the PL1 and PL2 power limits within the BIOS. Without making these adjustments, we saw no real benefit to overclocking our Core i7-10700K, even when overclocking to 5.1 GHz. We saw thermal throttling at 5.2 GHz, and unfortunately, the board's VDroop control is quite poor, with a much higher load CPU V-Core than is set in the BIOS. This caused havoc in our power consumption testing while overclocking. In our power delivery thermal testing, we also noticed that the VRMs got quite warm, and the CPU area of the socket was much hotter than it should be, especially for an ATX model. While this board is overclocking capable, it's designed to fly much more at stock than it is overclocked. Given the specialized features, we're ok with that.

The Supermicro C9Z490-PGW was initially launched with an MSRP of $395, but it is currently available to purchase at Newegg for just $360. This puts it directly against models such as the ASRock Z490 Taichi ($370), the GIGABYTE Z490 Aorus Master ($389), and the ASUS ROG Maximus XII Hero ($399), but the Supermicro is set apart with the use of a PLX chip. The Supermicro C9Z490-PGW is a different sort of motherboard, but still with a marketing strategy focused on the gaming market, but not conforming to include some of the highly marketable 'gaming' features such as RGB. It's a solid board with a solid feature set, but SuperO is not as widely known as other gaming brands such as Aorus or ROG. 

Read on for our extended analysis.

Visual Inspection
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  • edzieba - Tuesday, December 22, 2020 - link

    The x16 slots are 4 slots apart. Reply
  • Jorgp2 - Tuesday, December 22, 2020 - link

    Any GPU is single slot if you stick a water block on it. Reply
  • CheapSushi - Wednesday, December 23, 2020 - link

    No, shut up. It's great that SuperMicro is making these and it is an option. Why don't YOU focus on other products. Reply
  • idimitro - Monday, December 21, 2020 - link

    I wish Supermicro will do similar board for AM4 as well. Heck they can even use PLX chip with PCIe4 to PCIe3 capabilities. It will be able to provide a ton of PCIe3 lanes and let's face it - in the enthusiast/home server you don't really need all the PCIe4 you can get. Reply
  • lmcd - Monday, December 21, 2020 - link

    The only PCIe beneficiary is storage and even that is only realistically for peak throughput, which is usually not the bottleneck. Reply
  • npz - Monday, December 21, 2020 - link

    Yeah X570 boards now are moderately constrained and B550 boards are very constrained (in addition to the chipset being 3.0 instead of 4.0) as far as pcie lane allocation goes. For onboard and add-on devices you typically have to sacrifice SATA ports and/or pcie slots and/or lanes in those slots.

    A bridge + switch to convert the bandwidth from pcie 4.0 to pcie 3.0 would allow 2x the 3.0 downstream lanes for the same 4.0 upstream lanes. It would add more latency so it probably wouldn't be appropriate for time sensitive devices like audio, but otherwise perfect for lots of storage and nics and/or additional gpus for compute

    There are external PCIE switch backplane enclosures and proprietary server designs with hot-pluggable slots/modules, but those are really expensive.
    Reply
  • Foeketijn - Tuesday, December 22, 2020 - link

    Just any AM4 board. I am used to use Supermicro (often e3 xeon in boards). I sell computers that are expected to last. Not be a performance part perse.
    Now I use Asrock rack board for these cases.
    Also fine, but I was used to the supermicro ipmi (although the Asrock implementation is better).
    Reply
  • Jorgp2 - Tuesday, December 22, 2020 - link

    A PCI-E 4 switch would probably cost as much as this board. Reply
  • phoenix_rizzen - Monday, December 28, 2020 - link

    It would be nice if there was a B550 board that could convert the PCIe 4 lanes from the CPU to double the PCIe 3 lanes available for storage.

    Would be nice to have 6x SATA ports and 2x full-speed (x4) M.2 ports available simultaneously. And still have an x16 for the GPU. With all the USB/NIC ports off the chipset.

    Everything I've found so far let's you have either 6x SATA or 2x M.2, but not both at once (2x SATA ports use the same lanes as 1x of the M.2 ports).

    It's just not as "clean" to have to stick an HBA into the case. And having one M.2 slot be PCIe 4 while the other is PCIe 3 is unbalanced.

    Ah well, we can always dream...
    Reply
  • dsplover - Monday, December 21, 2020 - link

    Supermicro boards last forever. They don’t need to be “current.” My P4SCT+II still comes in handy for certain tasks. I do wish they would consider a Desktop AMD in 2021. Reply

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