Visual Inspection

Supermicro is more commonly known for its professional workstation and server-grade motherboards, and much of this can be seen across the C9Z490-PGW. First of all, there is no integrated RGB LED lighting, nor does it include any RGB headers. Instead, the SuperO branded Z490 model uses black heatsinks on a matte black PCB, with the silver SuperO armor on the full-length PCIe 3.0 and memory slots giving a nice contrast. The SuperO logo within the plastic rear panel cover illuminates, which glows white, which puts this as one of the least flashy premium Z490 models on the market. That being said, Supermicro instead relies on its feature set, and users looking for a board with more 'pizazz' surely won't have to look far.

The most prominent aspect of the Supermicro C9Z490-PGW is that it has four full-length PCIe 3.0 slots. This is because it is using a Broadcom PEX8747 PLX chip. The PLX chip essentially muxes the CPU lanes, allowing for up to 32 lanes across the four full-length slots. These can operate at either x16/x0/x16/x0 or x8/x8/x8/x8. One of the main benefits of muxing PCIe lanes is it offers more expansion capabilities with RAID controllers, FPGA PCIe add-on cards, compute cards, as well as additional network controllers. Located in the middle of each pair of the full-length slots is a single PCIe 3.0 x1 slot.


The Broadcom PEX8747 PLX chip on the C9Z490-PGW

For storage there are a pair of PCIe 3.0 x4/SATA M.2 slots, with the top slot supporting up to M.2 2280 drives and the second slot allowing for up to M.2 22110 drives. Despite the Z490 chipset supporting up to six native SATA ports, the Supermicro uses just four of these. The four SATA ports include support for RAID 0, 1, 5, and 10 arrays. Memory support is limited to DDR4-4000 officially, which is considered low compared with other Z490 models. The four memory slots support a maximum capacity of up to 128 GB and include SuperO metal armor reinforcement, with support for dual-channel memory.

In the bottom right-hand corner is a two-digit LED debugger, which can help diagnose POST issues. This is also coupled with an internal speaker, which is common on Supermicro boards, which beep upon POSTing and specific beep codes assigned to different issues. The C9Z490-PGW is also using an unconventional front panel header orientation for the power and reset jumpers, with a right-angled design instead of straight angled. This should help with cable management. The board uses six 4-pin headers for cooling, with two designated for CPU fans, one for a water pump, and three for chassis fans. 

Looking at the power delivery, it is using a 10-phase design, which is driven by an Infineon XDPE12284C PWM controller operating in an 8+2 configuration. It uses premium Infineon TDA21490 90 A power stages for the CPU, with slightly lower spec Infineon TDA21535 power stages for the SoC. This power delivery is quite capable, with a maximum output of 720 A for the CPU, although it uses just one 8-pin 12 V ATX power connector. Despite this, it is more than capable of pushing an Intel Core i9-10900K to its limits on paper.

Keeping the power delivery cool is a pair of heatsinks, which aren't connected by a heat pipe like other premium models. Both heatsinks feature an aluminum top with a large surface area with fins to direct airflow, but they don't have much overall mass. This means that the power delivery is heavily reliant on good passive airflow within a chassis.

The C9Z490-PGW uses a Realtek ALC1220 HD audio codec to power both the rear panel audio connections and the front panel audio header. This is assisted by two large audio capacitors and four small ones, with another shorter and stubbier one just above these. The audio area is separated from the rest of the board's controllers, although the HD audio codec isn't protected by an EMI shield.

The rear panel is a single USB 3.2 G2x2 Type-C, one USB 3.2 G2 Type-C, two USB 3.2 G2 Type-A, and two USB 3.2 G1 Type-A. The networking has two RJ45 ports, with one powered by an Aquantia AQC107 10 GbE controller, with another by an Intel I219-V Gigabit PHY. The W in PGW stands for Wi-Fi, and as such, it includes an Intel AX201 Wi-Fi 6 interface, which also includes support for BT 5.1 devices. For audio, it includes five 3.5 mm audio jacks and S/PDIF optical output powered by a Realtek ALC1220 HD audio codec. Users looking to use Intel's integrated graphics can use the DisplayPort 1.4 and HDMI 2.0a video output pairing. Finishing off the rear panel is a small but handy clear CMOS button.

What's in The Box

The accessories bundle includes four SATA cables, a quick reference guide, a rear I/O panel, and two antennas for the Intel AX201 Wi-Fi 6 adapter. Also present is an M.2 installation screw kit, a sticker sheet for marking up cables, and a driver and software installation disc.

  • Quick reference guide
  • Driver/software installation disc
  • Rear I/O shield
  • 4 x SATA cables
  • Cable sticker sheet
  • Front panel header adapter
  • 2 x Intel AX201 antennae
  • M.2 installation screw pack
Supermicro C9Z490-PGW Overview BIOS And Software
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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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