One Stop Systems PCIe Expansion Appliance – The Cube


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At Nvidia GTC 2015 we stopped by One Stop Systems booth and had a chance to look at their GPU expansion boxes. On display they had one of their huge 16x GPU boxes which stole the show. They also carry and wide range of expansion boxes from Flash Storage Arrays, Compute Accelerators, Servers, Desktop Expansion Appliances, PCIe Expansion kits and Disk Arrays.


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Today we will take a look at their Desktop Expansion Appliances, which include boxes ranging from a single GPU all the way to the CUBE 3 line which can house up to eight GPU’s in one box.

Desktop Expansion Appliances or CUBEs come in three different sizes and include up to eight superclocked GPUs, a cable adapter and cable.

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The sample we received can house two single width GPU’s or one double width GPU. GPU’s that can be used cover all types that you can run on your workstation which include typical graphics cards like 980gtx’s, Quadro’s, Tesla’s, AMD GPU’s  and Xeon Phi’s. This gives you a great deal of flexibility in deciding how you want to use your CUBE with your existing workstation. The connection interface that the CUBE uses is two Thunderbolt cards.

Packaging for our CUBE came with foam padding inside to protect the contents and a number of accessory boxes that included cables, PCIe expansion cards and a power brick.

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Here we get a closer look at what our CUBE looks like. The CUBE itself is very simple, light weight and made of plastic.

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Here we see the back of the CUBE which has a power connector at the bottom, two blank PCIe covers and it has a Thunderbolt card installed.

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At the top of the CUBE is a single retaining screw which is removed and we then slide out the PCIe tray. Here you can see the Thunderbolt card and two empty PCIe slots.

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The entire PCIe tray slides completely out of the housing. The main cooling fan is located at the front of the tray and an additional fan covers the interface chipset. At the back of the PCB there is an 8-pin power connector that is used to power up the installed GPU’s.

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For testing we used one of our Nvidia Telsa K40 cards which was simple to install and connecting the included power cable was also simple to do.

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Then the entire assembly slides right back into the CUBE housing. This entire process was simple and only took us a few minutes to do.

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The last thing to do is cable up the CUBE to our host workstation. The kit comes with an additional Thunderbolt card which would be installed into a PCIe slot in your workstation, then attach the supplied cable. Again this is a rather simple process and only takes a few minutes to complete.

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After we had the CUBE and K40 installed and connected to our workstation we ran a simple test to see how this would perform.

Test Configuration

Our test setup was very simple and not installed in a case.

  • System: Supermicro X10DRG-Q motherboard with 2x Intel Xeon E5-2699 v3’s
  • Memory: 256GB (16x 16GB) Crucial DDR4
  • Storage: SanDisk X210 512GB SSD
  • GPU: Nvidia Tesla K40
  • OS: Windows 8.1

There are no special drivers needed to get the CUBE up and running, everything is plug and play. We only needed to download the drivers for the Nvidia Tesla K40 which you can find on Nvidia’s website. Once the K40’s drivers were installed the K40 appears to the system just like it would if it was installed directly in the systems motherboard.

We ran two tests to see how the K40 would perform. In the screen shot above on the left side we have the K40 installed in the CUBE, on the right side is the K40 installed on the motherboard.

The test results show performance is almost exactly the same with the only difference being in the Memory Read and Write test results. This is because the CUBE is using the Thunderbolt interface and not direct PCIe bandwidth.

The cooling fans inside the CUBE kept the K40 inside the CUBE cool and we had no overheating issues when we ran AIDA64 stress test on the K40. It also ran with little to no noise for those that want a nice and quiet workstation.

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We would also like to add that our sample came with a Thunderbolt card that can be used to connect to an Apple workstation.

Our impression of One Stop Systems PCIe Expansion kit called the CUBE was very positive. Our CUBE was simple to setup and install in our workstation and it made little to no extra noise.

We would like to see a power switch at the front of the CUBE, right now the only way to turn it off is to unplug the power connector at the back. Metal construction for the case would also be nice but that would add extra costs. Sliding the tray in and out of the case can be a bit of trouble if it binds up, just take your time and work it out smoothly if it does this. You want to pull the tray straight out and not grab it by the top of the back PCIe frame.


  1. This would be cool if it didn’t cost $1,000+, and the fact that this isn’t mentioned in the article is disappointing. I’ve been looking for an external PCI-e solution for quite a while and all of them are way overpriced, for what they charge you could get your own boards built for less than half the cost. Magma and now MaxExpansion are just catering to niche markets that can justify the outrageous profit margins that they have. You are better off building a completely new system than trying to expand what you currently have.

  2. Especially given the cost, what’s the use case for this? I get external GPUs for laptops or other portable systems, but if you get a “workstation” with dual CPU, why not put the frigging GPUs IN IT?

  3. It would be great to see an Article with a small but capable Laptop connected to the 16x GPU Box and it’s 52.8 TFlops of computer power.

    Talk about ‘docking your Workstation’; you could do complex O&G calculations in the Office (or a Trailer) and then take the Laptop to the Field.

    You can move a lot of computing power (either physically or virtually) easily or stack them together for even more power.

    Now for more Programs that can run on such a Beast, and lower prices (and W’s) for GPUs yet to come.

  4. I wonder how similar that 16x GPU box is (on paper) to the Dell C410x. The C410x is 3U and offers the same number of expansion slots. The One Stop looks to be better designed – especially considering the power cable arrangement; It probably can allow a higher power draw.
    Would be great to get a demo unit to test.


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