Everything Homelab Node Goes 1U Rackmount Qotom Review


Intel Atom C3758R Performance

As a quick note: Some users may have seen this missing for a few hours. I saved over a draft when adding a different screenshot, and deleted this section that went to one of the web servers. Oops! Added back.

In terms of performance, it is very close to the fanless unit that we tested previously. We did our 10 runs of the entire benchmark script and we were +/- 1.5% which is within a margin of error.

Intel Atom C3758R Lscpu Output
Intel Atom C3758R Lscpu Output

This is a very popular CPU. It is found in network stroage appliances like the TrueNAS Mini XL+ and TrueNAS Mini X+. Since this is designed to only have up to four SSDs (two SATA two PCIe Gen3 x2) and four HDDs (via SFF-8087), this is plenty of CPU for that. Having the built-in Intel X553 is a big reason that they are used in storage appliances.

Intel Atom C3758 X553 Networking
Intel Atom X553 Networking

Many think the Atom cores are too slow. They frankly do not make for a great Windows experience (although it runs Windows.) For most stroage, networking, and even infrastructure containers and services, these are fine cores, and are designed to keep frequency transitions minimized to give better performance.

A Word On Routing, Firewall, and VPN Performance

The Intel Atom C3758R powers the Netgate 8200 Max. While we have no issues passing iperf3 traffic over a pair of 10G ports on this machine, Netgate does a bit more testing including firewall and IPSec VPN, and also using IMIX packets instead of simple iperf3 traffic.

Netgate 8200 Max Specs
Netgate 8200 Max Specs

Still, the company is able to handle a lot of throughput using this box. On the IPSec VPN side, Netgate is using the pfSense+ feature of using QAT support. That is an accelerator that lets the Atom C3758R punch above its TDP “weight.” The performance is also better on the Linux-based TNSR side. Something important is that this QAT version was good for IPsec with AES-GCM-128 acceleration, but this did not accelerate things like the ciphers behind WireGuard. Still, the QAT aspect is important, especially as it has been folded into Ubuntu 24.04.

Python Linux 4.4.2 Kernel Compile Benchmark

This is one of the most requested benchmarks for STH over the past few years. The task was simple, we have a standard configuration file, the Linux 4.4.2 kernel from kernel.org, and make the standard auto-generated configuration utilizing every thread in the system. We are expressing results in terms of compiles per hour to make the results easier to read:

Intel Atom C3758 C3758R Linux Kernel Compile Benchmark
Intel Atom C3758 C3758R Linux Kernel Compile Benchmark

Here, performance is good but nowhere near a modern Core i7 or Ryzen 7. It is more like an Intel N100.

7-zip Compression Performance

7-zip is a widely used compression/ decompression program that works cross-platform. We started using the program during our early days with Windows testing. It is now part of Linux-Bench.

Intel Atom C3758 C3758R 7zip Non QAT
Intel Atom C3758 C3758R 7zip Non QAT

Again, this is good performance, slightly ahead of the N100/N200. Of course, the Atom C3758R has much more I/O than the Alder Lake-N CPUs.

OpenSSL Performance

OpenSSL is widely used to secure communications between servers. This is an important protocol in many server stacks. We first look at our sign tests:

Intel Atom C3758 C3758R OpenSSL Sign Non QAT
Intel Atom C3758 C3758R OpenSSL Sign Non QAT

Here are the verify results:

Intel Atom C3758 C3758R OpenSSL Verify Non QAT
Intel Atom C3758 C3758R OpenSSL Verify Non QAT

Again, we do not do these charts with QAT, but the performance is solid. With QAT, these go from eight core workloads to a portion of a single core, and increase in performance.

Next, let us discuss power consumption.

Power Consumption and Noise

The PSU that came in this unit is the Mean Well LRS-50-12 a 12W 50V unit. This is a lot better than many of the low-end PSUs we have seen previously.

Qotom 1U C3758R Internal Mean Well LRS 50 12 PSU
Qotom 1U C3758R Internal Mean Well LRS 50 12 PSU

Something that we checked is that you can use a DC power input, even though there is an internal power supply. If that internal power supply were to ever break, for example, then there is an external power option.

Qotom 1U C3758R Front Ports
Qotom 1U C3758R Front Ports

On the power side, at saw idle in the 20W range and go up to around 30W under load. Of course, with additional components installed, this can go up by 10-15W. On the noise side, it is far from silent. At idle we saw around 36dba and under load closer to 40dba. In a rack, a lot of this noise is going to depend on what is underneath the system since that is where the fan is.

Qotom 1U C3758R Front Angle
Qotom 1U C3758R Front Angle

We also hooked one of the fanless unit external power supplies to the 12V connector on the front of the system, and it worked, actually providing 1-1.5W lower power consumption. It seems like between the fan and the internal PSU we are getting 1-4W higher during use on the rackmount versus the fanless desktop unit.

Intel Atom C3000 Denverton Package STH
Intel Atom C3000 Denverton Package STH

One important note on the Intel Atom C3000 “Denverton” chips is that they are embedded parts meant specifically for embedded applications. That means they are rated to run up to 82C Tcase. They also have very small idle-to-load frequency differentials. This system just runs at 2.4GHz non-stop under load and the cores do not step down. By keeping consistent power states and frequencies, the cores do not have to pause for a few cycles to spin up or down, and that improves network consistency, reducing things like jitter. A Core i5 may be faster, but these are chips designed explicitly for 10GbE network and storage.

Next, let us get to some thoughts on customization.


  1. That’s an amazing configuration, and the ECC option was critical to include IMO. I have three Supermicro boxes configured as a 3-node cluster. Each include multiple SFP+ and Intel i350 ports and support ECC. I upgraded all of them with 128GB RAM, three NVMe’s, and a dual port 25GbE Mellanox card.

    This is why I think the MINISFORUM MS-01 falls short of practical deployments in a homelab, because without ECC support, the true potential cannot be realized. The MS-01 is a great machine, but was a missed opportunity—hopefully the MS-02 includes ECC.

  2. Thanks for the great job STH team is doing
    As you mentioned the NVMe area gets really hot that is why it is important to use low performance NVMe to manage heat. In my Mini PC I mounted 3x80mm FANs & replaced the bottom cover with a mesh just to keep that area relatively cold. I think this 1U setup it is great but it would be better if they made a mesh to mount tow fans instead of the WiFi antenna holes

    Again thanks a million

  3. My fanless non-rackmount model came with a Channel Well Technology (CWT) PSU, so even those seemingly no longer come with no-name PSUs, at least not all the time.

  4. My only problem with this is that the new E-cores are twice as fast as these. It’s a hard value prop when the N305 is more than twice as fast and uses less power. It feels like there will imminently be a new C-series line and that any C3000 series is already obsolete.

    Granted, that’s somewhat hyperbolic, I do understand the differences between the N305 and the Cx000 atom lines (I have 3x C3758 systems in my lab today).

    But I hope you see my point; the C3000 series is getting quite old to be part of greenfield deployments. Unless you need the crypto throughput or >2.5G networking, I’d add an N305-based system to my lab before any C3000-based systems.

  5. How is the power supply connected to the motherboard? All the pictures show the wires disappearing under the board, but I do not see any connector in the picture of the underside.

  6. I have the fanless version, installed 32GB ECC RAM and also noticed the long boot time. I’m wondering if they ever disabled a lot of extra memory training/margining tests that developers usually use before release. It doesn’t hurt to have all that extra training enabled, but the value is debatable in a production system.

  7. I would like to see also Wireguard perfomance tests.
    To my knowledge it relies purely on CPU power so that would be a nice datapoint.

  8. Why would you have a fan on the bottom of a rack mount unit? It will be blocked by whatever is mounted below.

  9. How about putting a m2 to sff8087 adapter in there as well? Then you could connect to that 8 drive external housing and access all drives

  10. Has anyone installed VyOS or what do you use for routing on these? Also some people complained about the CPU being slow compared to other options… are any of these other options available in rackmount or with 10GbE?


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