Limitless Networking

Home Lab Server

Currently I’m doing a lot of testing at home on Network Virtualization solutions, like VMware NSX, Juniper Contrail, etc. Therefore I was stressing my current single home server quite a lot. Which is a custom build Xeon E3-1230 quad core with 32GB of RAM and 128GB SSD. I built this server according to the specifications found at: . This has been a great investment as I’m running nested virtualization for both KVM and ESXi hypervisors and run the testing in there. Due to the fact that for a decent Network Virtualization (NV) set-up you need quite some memory, especially if you look at the memory utilisation of the NV Controller VMs, I had to expand my lab. I chose to extend it with an additional server so I would be physically redundant as well, making it easier to run upgrades on the physical machines.


My requirements aren’t difficult as I mainly perform feature testing in my lab I don’t need a lot of CPU performance. There are no “Production” VMs running, everything is there to play around, so downtime is not a problem if necessary.
Other requirements:

  • Average CPU performance
  • Nested virtualization support
  • At least 32GB of RAM, preferably (or upgradable to) 64GB
  • 4 or more SATA3 connections (to grow to a VSA set-up)
  • 2 or more 1Gbps Ethernet NICs
  • Out of band management (IPMI)
  • Low power
  • Small footprint
  • Low noise

Especially the last 2 requirements are important to me. I run the lab on a shelf in a large closet, so I barely want to hear fans and I want to keep the footprint small to make sure I can expand the lab further, without having to sacrifice another shelf.

Bill of materials

The bill of materials was as follows. I will explain the reasoning behind each component in detail. You can click the SKU to purchase this item on Amazon.

Description SKU
Motherboard ASRock C2750D4I
Memory (4x) Kingston DDR3 1600Mhz 8GB non-ECC KVR16N11H/8
Storage Samsung 850 Pro SSD (128GB) MZ-7KE128BW
Case LC Power LC-1410mi
Fan Noctua NF-R8 PWM

I ordered this bill of materials at the Dutch webshop, take a look at the screenshot below to find the exact part numbers.



I was looking at various options for a good home lab CPU. I first looked at an Apple Mac Mini, it’s a powerful processor, low power and footprint, but the 16GB limit of the system was no option for me. The same goes for the Intel NUC boards. I continued the search for a decent multi-core mini-ITX motherboard that could hold a lot of memory. Going for a Xeon was the only option to give me the option over 32GB. Until I found the Intel Atom Avoton chip. This next generation of Intel Atom processors is a very interesting one for home lab servers. You will also find that the latest generation of Synology NAS systems also runs on this same processor. This chip features a 4-core or 8-core processor which, when looking at single core benchmarks, is not the fastest ever, but the multi-core performance definitely makes up a lot! Especially in highly virtualised environments the multi-core architecture is used very well. I looked at various benchmark tests ( and found that this CPU would give me more than enough CPU performance for the tests that I’m running in my home lab while still be very quiet and low power. The performance averages to about half of the performance that my existing set-up with Xeon E3-1200 V3 would give me.
Then feature wise this CPU gives you everything you want for a virtualization lab, which is:

  • 64-bit CPU
  • Supports VT
  • Supportes nested virtualization

The next best thing was that the CPU only comes soldered to the motherboard and can be passively cooled! Which brings us to the next topic regarding the motherboard.


There are 2 good options for a mini-ITX motherboard that features the Intel Avoton C2750. I only looked at the 8-core model, which is quite a bit more expensive, but will give you double the CPU power (especially in VM environments). There is also a C2758 model available, which does not feature TurboBoost. Which I thought would be beneficial in my lab as I need as much performance as I can. The C2758 features QuickAssist which is used for integrating accelerators as used on embedded systems (like a NAS).

I narrowed my choice down to 2 mini-ITX motherboards I found that also feature all my other requirements for networking and out of band management.

Supermicro A1SAi-2750F (
+ This board features a passively cooled C2750 (some have a fan on board
+ 4x 1GE LAN on-board
Uses SO-DIMM modules (notebook memory)
Marvell NIC, requiring an additional driver in ESXi

I’m usually a fan of Supermicro as all my previous home servers had a Supermicro motherboard. Their support for ESXi is excellent and they have a decent price. The big downside of this board is the use of SO-DIMM modules, which are more expensive than the regular DDR3 DIMM’s.

ASRock C2750D4I (
+ Passively cooled C2750
+ Regular DDR3 DIMMs
+ A ton of SATA ports to have the option to build a storage heavy server in the future
+ Intel NICs that have their driver built-in to ESXi 5.5 update 2
Only 2x 1GE LAN on-board

I chose the ASRock based on the many benefits this board has over the Supermicro. It was cheaper, supported cheaper DIMMs and didn’t require an additional driver installed in ESXi 5.5 update 2, making upgrades easier. The many SATA ports on the system make it an excellent board to grow to a VSA appliance in the future when required.

NOTE! Even though the CPU is passively cooled, the board requires you to connect a fan to CPU_FAN1 otherwise the board will not power up.



I first tried to find 16GB DIMMs that were affordable. Unfortunately a single 16GB DIMM is currently the cost of 4x8GB DIMMs. My choice was therefore brought back to getting 4x 8GB DIMMs to get a total of 32GB memory in my next server.
I cannot stress enough that you should purchase from the Memory QVL that your motherboard supplier publishes. Any other DIMM may work, may work unstable or may not work at all. Fortunately a couple of Kingston’s affordable line of memory was tested by ASRock, so I didn’t look further and got those. The server is rock solid on these Kingston DIMMs already running for weeks.

Current Memory QVL for the ASRock C2750D4I

I omitted the 4GB DIMMs from the table below as I need at least 32GB of RAM in the server.

Type Speed DIMM Size Vender Module
DDR3 1600 non-ECC 8GB ADATA AD3U1600C8G11-B
DDR3 1600 ECC 8GB Apacer 78.C1GER.AT30C
DDR3 1600 ECC 8GB Crucial CT102472BD160B.18FED
DDR3 1600 ECC 8GB innodisk M3C0-8GSS3LPC
DDR3 1600 non-ECC 8GB Kingston KVR16N11H/8
DDR3 1333 ECC 16GB Memphis IMM2G72D3DUD8AG-B15E
DDR3 1333 non-ECC 16GB Memphis IMM2G64D3DUD8AG-B15E
DDR3 1333 ECC 16GB Memphis IMM2G72D3LDUD8AG-B15E

If you would like to purchase the 16GB DIMMs mentioned on this Memory QVL please contact ASRock Sales  ([email protected]) for a quote. They sell and ship these Memphis DIMMs worldwide.


I’m currently happily using a Synology DS713+ 2-bay NAS with 2 Western Digital RED 3TB disks for over a year. It is my primary source of shared storage for everything. Including all of the VMs. Therefore I don’t need a ton of storage in my server. I may want to play around with VMware VSAN or other VSA options, but for now I’ll keep everything stored on NFS shares on my Synology DS713+. The disks in the NAS are mirrored, meaning I only get IOPS from a single disk. While running 20-30 VM’s on this NAS, I notice that performance is going down. Therefore I chose to use a small 128GB SSD in both of my servers and use VMware Flash Read Cache. This technology lives inside ESXi will cache all the Disk Reads performed in a VM (when enabled for Flash Read Cache) and will also use the SSD as SWAP file instead of a file located in the folder where the VM is stored. This enhances performance a lot in my lab as my VMs are not storage heavy and usually consist of system files of the OS and some database files. When they are first read from the disk they are stored in my server’s SSD and especially Windows and Linux VMs benefit a lot from this!

In the screenshots below you can see my current usage of the Flash Read Cache.


Case and cooling

The case I chose is not a very exciting one. It’s much bigger than required for a mini-ITX board, but I wanted a low profile case that would fit on top of my existing server and had a decent power supply built in (for cost savings). The case I chose ended up being a great one, as it features a fan that sucks air in to the chassis through the power supply.

As mentioned before the CPU is passively cooled, but as it’s being heavily used in ESXi running 10 or so VMs at any time. I needed additional cooling. In my existing server I’m using Noctua fans as they are amazingly quiet and perform very well! I chose a simple 8mm fan and mounted it right above the CPU heat sink to suck air out of the chassis again. This way it creates a great airflow through the case and my temperatures are very low for a server that is constantly using quite some CPU resources, while still being almost completely silent.


ESXi and vMotion

As the internal SSD is used only for caching I installed ESXi 5.5 update 2 on a USB key. As no other storage is required to run ESXi, the USB key works fine, as long as logging can be exported to an external datastore (NFS for example).
When I added the new server to the existing ESXi cluster there is of course a big gap in CPU generation and features, as the other server is a Xeon. VMware has a great feature called “EVC”. This feature makes sure that you can limit the CPU features a VM uses so that it’s compatible with all different generations of CPU’s in your cluster while still utilise Live/Hot VM Migration (vMotion). The Avoton CPU has features that are equal to the “Intel Westmere” generation of CPU’s. This means that changing the EVC setting to “Westmere” enabled live vMotion for all my VM’s in my “Physical” cluster.



As I have DRS enabled in my cluster the system automatically moves load between the different servers. When I’m working on my lab set-up now I have to say that the only way to see which CPU I’m running on is at boot-up of a VM. The Xeon processor has more power and that’s noticeable during the boot-up. After the system is running it’s very hard for me to tell which CPU it’s running on and that is exactly what I wanted to achieve. The Avoton CPU is an amazing system as a home lab when you are purely feature testing. Again this is not a performance beast and you should not run any tests that should compare to a production system. This system is meant for playing around with many different features.

Currently both of my hosts are again running at 80-85% memory utilisation, so it’s heavily used and I couldn’t be happier with it.

If you have any questions on my set-up please comment below!



  1. Greg

    Cool article. I am curious. How are you doing the “meshed” environment with ESX and KVM on the same servers?

  2. Rafael

    Well done mate. I have got a similar lab to yours too on my blog .. Lok for the vcap-dcs blog series. Enjoy your labbing. Cheerd.

  3. Timothy

    Will this be enough for CCIE R&S and SP virtual lab setup? Thanks

    • rickmur

      You could start a couple GNS3 VM’s on here, but they will work fine on a decent laptop as well! This set-up is better suited for a VMware test environment.

  4. r0y89

    Hi Rick, How is your avoton running? I’m planning on building the same machine to run some vm’s. Does it run server 2012 with exchange?

    – another dutch IT guy

    • rickmur

      It’s running fantastic! I haven’t tested Exchange. If you put some load on the system you feel that the CPU isn’t strong, but for lab use, it’s great.

  5. dancwilliams

    GREAT write up! Thanks for taking the time. I do not know why I never thought to use the Atom processor. Wonderful idea

  6. anas

    Thanks Rick Mur a lot. I would like to invest in PC for my futur certification CCIE rEDHAT, F5 and chekpoint LABS. Do you think it is suitable for me ? thank you.

  7. anon

    I don’t believe this setup supports passtrough (VT-d)

    • rickmur

      Correct. The Intel Avoton CPU doesn’t support VT-d. I don’t need that for my lab tests. I just need VT-x support, which it has!

  8. Manoj

    Thanks Rick for sharing your experience of using the new Intel Avoton mobo. Very interested reading and I too have been dwelling on whether to go for a Asus P9X79 PRO which is can take up to 8 memory slots and capable of handling 128GB of RAM with a Xeon E5-1620v2 but it is a big ATX board. The cost of the processor is almost the same as the Avoton MB so I would like to also go for one of these.

    Besides the IOPS bottleneck that you are seeing in your setup using the ASRock mobo, yes SSD is the way forward for improving performance in lab environments like these. Nevertheless, do you see any bottleneck on the CPU it self when you have several VMs running at the same time during lab use. In short does the cpu have sufficient horsepower especially when you are doing nested ESXi with nested VMs running (3 levels). What is the cpu utilization and how many VMs can you run at the same time without lose before you begin to experience sluggish usability when administering the services running on the VMs.

    • rickmur

      I haven’t tested 3 levels deep, what’s the use case for that? If you are really looking for performance, you need the Xeon’s. This is a fun proc for a home lab where you want to test features. However, my lab never feels sluggish regarding CPU. Load is quite high, but it’s handling it well!

  9. Archie

    Thanks for sharing your experience. I’m looking to build a low power ESXi home lab with small footprint. Have you tried running it with two nested ESXi’s? I wanted to run AutoLab to get my hands on new vSphere 6.

    Like Manoj, I’d be interested to know as well if there’s any performance issue when running nested VI.

    Grateful if you can share.

    • rickmur

      All doing fine. I’m running 4 nested ESXi servers that are running a few VM’s each. Nested performance is almost equal to native performance.

  10. Manoj

    Hi Rick!

    Can you please shed some light on your experience on how you are finding the multi-VM and Nested ESXi/Hyper-V performance on this system.

    Like Archie and myself I am sure there must be lots of techs curious to find out how this system board performs with lost of VMs – off course using SSD as the storage media.

    A new blog article would be greatly appreciated!


    • Archie

      Hi Manoj,

      I found two blogs which might interest you if you’re looking for low power ESX home lab. The power and footprint will not be as small as what Rick had built.

      But I would instead use the Gigabyte GA-B85M-D3H mobo instead of the

      In case I would decide I will not go the Avoton route, I will use Intel Core i5-4570S @ 2.90GHz, Gigabyte GA-B85M-D3H.


      • Prabjeet Singh

        Hi Archie,
        I am using Gigabyte GA-B85M-D3H. Didn’t get hot migrations and EVC working. I am running vsphere 6.0 with Haswell G3220 3.0Mhz processor. Any suggestions please for vMotion and EVC? I didnt find any thing to enable in Bios, but if you know if this Mobo supports vMotion?

      • Prabjeet Singh

        Hi Archie,

        With Gigabyte GA-B85M-D3H, I do not get vMotion and EVC working. All other requirements are met. I am running intel G3220 3.0 Ghz Dual core process on this Mobo. EVC complains-

        “The host’s CPU hardware should support the cluster’s current Enhanced vMotion Compatibility mode, but some of the necessary CPU features are missing from the host. Check the host’s BIOS configuration to ensure that no necessary features are disabled (such as XD, VT, AES, or PCLMULQDQ for Intel, or NX for AMD). For more information, see KB articles 1003212 and 1034926.”

        Cannot find option to disable AES/PCLMULQDQ in BIOS

  11. Pierre-Louis

    Hi Rick,

    Just a few additional questions about your home setup:
    1/ How do you deal with Management/Production traffic with only two pNIC ports? Do you dedicate only one port for each type of traffic? or do you share everything on a LAG?
    2/ You were writing about Virtual SAN, how do you consider this new setup? Do you think your BOM is sufficient? or you’ll need additional pNICs to implement Virtual SAN?
    3/ Did you take a look at GigaByte GA-9SISL Motherboard which gives you 4 LOM ports?
    4/ Do you have a diagram of your NSX setup?
    5/ Is this setup compatible/enough to test an OpenStack environment with Control and Compute Nodes?
    6/ Are you satisfied with this ASrock Motherboard?

    Thanks for your replies

  12. Marek

    non-ECC RAM? Please reconsider.

  13. Manoj

    Hi Rick, thank you for the sharing your experience on how the 2750 is performing real life especially when doing Nested ESXi VMs up to 4. I do a fair bit of work with testing automation scripts and feature testing on Horizon View and Citrix XenDesktop which requires being able to spin up a couple of Win7/8 VDI instances running on the nested ESXi VMs.

    From what you have said I am quite confident this mobo would work nicely as a ESXi lab for testing features and training use.

    I am debating now whether to go for the Asrock or Supermicro, currently leaning towards AsRock because if happen to have 4 x 8GB DDR 1600Mhz DIMMs which i could re-use. Whereas with the Supermicro it requires SO-DIMMs and they must be unbuffered ECC which are quite pricey.

  14. John

    Hello Rick,

    The Supermicro A1SAi-2750F does not have Marvel NIC’s (as you wrote) but Intel I354 Quad GbE controllers.
    Still, they too need addidtional driver support in ESXi 5.5

  15. John

    Short update on my comment: ESXi 6 installs out of the box on the Supermicro A1SAi-2750F. It recognizes the Intel I354 Quad Nic without any problems.
    I boot from a USB 3.0 Thumb-drive.

    • rickmur

      Good stuff! Still happy with my ASRock. It’s rock solid. Hope the Supermicro gives you the same! Did you find the right price for the SO-DIMM memory?

  16. Askar

    Hi Rick, could you please share performance graphs of CPU and also show how many VMs you are running on Avaton? what is the ratio of vCPU/pCPU?

    I am just about to build a lab with two ESXI hosts with C2750DI and a bit concerned about performance.
    I am going to run DC/vCenter/Xenapp/SQL,vCloud suite, Horizon. Surely, I am not going to use them all at once, but still not sure if the Avaton will handle load pretty well for a lab.


    • Askar

      I got all the components including ASROCK C2750D4I and finalising the build of the lab. Performance looks very descent so far, but I will provide some stats a numbers a bit later

  17. Askar

    Just noted your remark “NOTE! Even though the CPU is passively cooled, the board requires you to connect a fan to CPU_FAN1 otherwise the board will not power up.”

    In my case that wasn’t true. I hooked up the only case’s fan to FRONT_FAN1 and haven’t had any issues.

  18. askarkopbayev

    Finally got the lab configured and had some time to write a couple of post about ESXi servers on Avoton CPUs.

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