GPU-Xpander

GPU-Xpander allows you to convert your PCIe slot and power-limited Windows, Linux, or Apple OSX computer into a high-end, high-performance workstation for use with multiple PCIe adapters and controllers, including professional-grade discrete 3D graphics, audio and other multi-port IO adapters such as FireWire, USB 3.0 10/40Gbps Ethernet, or Infiniband for thousands of dollars less per seat than buying a specialized, overpriced custom PC system.

*** New for 2014 - PCIe Gen3 16-channel…128Gbps data connectivity speeds! ***

Use your favorite “slot and watt limited” PC – Dell®, HP®, Lenovo®, or Apple Mac Pro – to tackle HPC and/or graphical rendering projects. It takes only a few minutes to supercharge your PC by adding a GPU-Xpander to make scientific calculations or photorealistic 3D rendering lightning fast.

  • For connecting Xpander to desktop PCs or Apple® Mac Pro™, at PCIe Gen2 or Gen3 16-channel data transfer rates, with desktop applications, click here.
  • For connecting Xpander with support for between 2 - 8 double-wide GPUs, at PCIe Gen2 or Gen3 16-channel data transfer rates, to rackmount computers, click here.
  • For connecting Xpander with support for 4 double-wide GPUs and 2 single-wide cards (such as multiple RED Rocket/Rocket-X, SDI capture, or audio capture) to rackmount computers, at PCIe Gen2 or Gen3 16-channel data transfer rates, click here.

GPU-Xpander provides an independent life support system with its own power and cooling dedicated to the GPUs themselves. Xpander is a PCI Express bus extender, so you don’t tax your existing PC workstation's or server's cooling capability, power supply(s), or violate its warranty by operating it beyond its specifications.

You need Xpander if the hardware and software combination you intend to use runs in your computer, but causes over-current or overheating problems. GPU-Xpander is a hardware-only solution: no software required. Cubix supplies each Xpander its own power supply(s) and cooling; it requires no power from the host computer. Simply plug the Cubix-supplied host interface card (HIC) in your computer's PCIe slot, connect GPU-Xpander, power up and install device drivers.

Supports A Variety Of Single And Multiple GPUs

GPU-Xpander, depending upon the model, supports 2 to 16 NVIDIA® GPU adapters including, but not limited to:

Supports A Variety Of PCIe Adapters And Controllers

Xpander supports two to six multi-port, multi-function PCIe adapters including:

  • SDI capture & output cards (Blackmagic Design®, Bluefish444® AJA®, NVIDIA, and others)
  • FireWire 400/800
  • USB 3.0
  • 10/40 Gbps Ethernet fiber-optic or copper
  • Infiniband
  • Professional audio AES or MIDI

Supports A Variety Of Software

GPU-Xpander supports a variety of operating systems and applications, including but not limited to:

Retrofitting Existing PCs

If you are thinking about adding powerful graphics adapters to your existing computer, learn from the mistakes of others. There are a lot of uncertainties. Is there adequate power for one or more additional 200+ Watt GPUs in your current system? How about enough power for two double-wide 200+ Watt adapters? Will adding a high-powered graphics adapter overheat your workstation or server? Do you have enough physical space for one, two or more graphics cards inside your PC? With Cubix GPU-Xpander systems, questions about using an existing PC have answers.

Buying proprietary oversized workstations to run GPU-enabled applications may put you at odds with your Information Technology and Purchasing departments. Why invite conflict? Instead, connect your limited but familiar corporate-approved PC to an Xpander. This combination allows you to garner the best possible return on your PC investments from existing service contracts, familiar sourcing, and corporate standards purchasing perspectives. Contact Cubix for guidance on connecting your current deskside or rackmount computers to Xpander.

Installation And Use

Installation is straightforward. Insert an Xpander host interface controller (HIC) into an available PCIe slot in a PC or Mac Pro, connect the cable to the Xpander, load the GPU or other device driver on your host computer and you're ready to harness the power of GPU-computing!

With most models, multiple users can take turns using GPU-Xpander around the office. If the need for GPU computing, hardware acceleration, or multi-port adapters is sporadic among users, install an Xpander host interface card (HIC) into each workstation and move the Xpander to each as needed.

GPU-Xpander is also available in rackmount versions for use with rackmount Cubix Host Engines, LaserBlades or 3rd party rackmount servers. A rackmount server needs only rack space available immediately above or below it and one PCI Express slot available. Install a HIC into each blade or rackmount server, connect each to Xpander and install the device drivers. Now your “slot and watt limited” blade or rackmount servers have one or more GPUs plus I/O other adapters externally available.

GPU-Manager For Microsoft Windows


Cubix GPU-Manager is an application that provides management of graphics processing unit (GPU) clusters in Cubix Xpander enclosures. The primary aims of GPU-Manager are asset management, health monitoring and technical support data of GPUs. GPU-Manager runs under Microsoft Windows (other OS support in development) but does not support PCIe devices that are not GPUs. If you run Microsoft Windows on computers connected to an Xpander, you can download and install GPU-Manager by creating an account on the Cubix Website here.

  • Asset Management - GPU-Manager collects data from distributed GPU clusters into a central management console that lists the following:
    • all attached GPU-Xpander enclosures
    • the GPUs within each Xpander enclosure
    • GPU capabilities such as number of GPU cores, amount of RAM, etc.
    • operating system and software driver version numbers
  • Monitoring - GPU-Manager continuously monitors GPU clusters, and provides the following:
    • link status, number of lanes, and link speed for each enclosure
    • temperature, fan speed and GPU load characteristics for each GPU

For details or answers to specific questions, visit one of the GPU-Xpander product model pages or contact Cubix. For part numbers, prices and purchase information, visit the Cubix GPU On-line Store.