Today we are going to look at a motherboard that will be the first of a new generation for STH. The Supermicro A3SPI-4C-LN6PF is the first Intel Atom C5000 “Parker Ridge” platform that we have tested. This is a new generation of Intel Atom that is the update to the Intel Atom C3000 “Denverton” launched in 2017. While this may not be the most exciting 4-core platform, we wanted to show off what is new. What is more, many of our readers may be overlooking this new platform because we found conflicting networking specs in the spec pages, manual, and elsewhere so it was time to investigate further.
As a quick note, this motherboard is still listed as “coming soon” on Supermicro’s website at this point, but we managed to get one early. So early that Supermicro does not know we have one of these. It may also mean that the documentation is not updated yet.
Supermicro A3SPI-4C-LN6PF Overview
The A3SPI-4C-LN6PF is a standard mITX platform. That means it is 6.7″ x 6.7″.
Onboard, we have the Intel Atom C5315. Supermicro uses a number of SKUs, but this is the 4-core / 4 thread unit. Intel actually sells the chip itself for $213.
That should seem like quite a bit. The Intel Atom C3558R is the previous generation 4-core model, and that was $93. Intel has a number of new features onboard, but the new part uses the updated efficient core design and has new QAT. At the same time, it has a much higher TDP (38W v. 17W) and fewer maximum PCIe Gen3 lanes (12 v. 20.)
As a result, we think of the Intel Atom C5315 as a “funky” chip. It is better in some ways, but in others it does not feel like an enormous upgrade over a 2017/ 2020 (the Intel Atom C3000 line was quietly refreshed in 2020 with the C3558R.) Still, that is the chip that is on this motherboard.
Powering the unit, even though this is a mITX platform, Supermicro has both a traditional 24-pin ATX as well as an 8-pin for DC input (we used the DC input and the platform generally ran sub-40W although with higher power optics, more drives, and so forth we could push it higher.
A really nice feature of this motherboard is that it is using DDR4 memory and RDIMMs. The Intel Atom C5315 has a de-rated speed of DDR4-2400 so we were able to re-use some 16GB RIMMs we had. New servers use DDR5 and can only use RDIMMs, so this is a welcome difference with the platform. If you want to learn more about memory speed scaling, we have this piece. We also have a piece on server DDR5 RDIMMs v UDIMMs and a video for that covering both.
The M.2 slot is a M.2 2280 (80mm) slot that operates as PCIe Gen3 x4.
Along the bottom, the PCIe slot may look like an x8 slot, however, it is only a PCIe Gen3 x2 slot. Supermicro uses an open-ended slot, but the bandwidth is not high enough for dual port 25GbE adapters or anything like that. With this motherboard, the highest speed PCIe slot is actually the M.2 slot.
There is a second B-key M.2 that is a 3052 slot that is PCIe Gen3 x2, USB 3.0, SATA III. This is designed for adding networking. Below that, there is a nano-SIM slot that we did not get to use.
M.2 storage has really taken over here. There is a single SATA III “gold’ port that allows one to power a SATA DOM without a cable. The Oculink port is spec’d as SATA only, and the cables are relatively pricey. It almost feels like that was not a primary feature of the motherboard, so an Oculink connector was added just to save PCB space.
The primary I/O of the motherboard has Supermicro’s traditional IPMI out-of-band management port, two USB 3 ports, and a VGA port for administration.
The big story though is the networking. Four ports are all 1GbE ports. These are a little different since they are not the Intel i210/i211 ports nor the i350 ports that we have been accustomed to seeing for years. Instead, they use a Marvell PHY that is transparent to the OS, but the MAC is actually the Intel E822-L built into the Atom C5315. The SFP cages are listed as SFP, not SFP+ on the spec page in three places (below the motherboard and #6 key features to the right, and not shown in the networking section below.) They are also listed as SFP in the motherboard manual.
While the prospect of having only 1GbE (more on testing the speed of those SFP ports later in this article) left us nervous, the chip does support Intel QuickAssist that we have tested extensively. This is the Gen2 QAT, not the Gen3 that we get with the Snow Ridge P5300 parts.
There is a lot here, but we see this as the successor to the Intel Atom C3558 as a 4-core part in the Atom line for embedded appliances.
Next, let us get to management.