OWC Mercury Helios FX 650 eGPU Chassis REVIEW


The Mercury Helios FX 650 is a high-performance external GPU that is designed to add performance to a Mac or Windows machine that is compatible with Thunderbolt 3. The chassis does not ship with a GPU (unless you purchase a special bundle). It is ready for the GPU of your choice to be installed. The Helios FX 650 is upgradeable unlike other eGPUs, which makes it easier to move to the next level of GPU when the time comes. The Helios FX 650 features a large variable speed, temperature-controlled fan but is quiet in operation. In addition to the increased GPU power, the chassis also provides up to 100W of charging power for a connected notebook.

  • Elevate gaming performance
  • Works with any Thunderbolt 3 laptop and desktop
  • Ready to go, plug in solution
  • Upgradeable eGPU chassis
  • Recyclable chassis
  • Mac and Windows compatible
  • macOS 10.13.x and later plug ’n play, enjoy 10.14.x “Mojave” optimizations
  • Exceed AVID Media Composer system requirements
  • * Utilize multiple displays
  • For desktops and notebooks — even powers/charges notebooks up to 100W
  • Add HDMI, DisplayPort and DVI connectivity
  • Thunderbolt 3 cable included


When I first received the Helios FX 650 I was thrilled. It arrived in a large OWC-branded box. The only things included with the shipment were the chassis, a user/installation guide, a Thunderbolt 3 cable, power supply, and cushioned packaging. It is quite a hefty chassis. By it’s specs it is just over 7 pounds — without a GPU installed. Installation of our chosen GPU was very simple. Even if you’ve never worked with an eGPU chassis or assembled your own computer, you will be able to install a graphic card.

  • Ports: HDMI, DisplayPort, Dual-Link DVI
  • 1340 MHz Core Clock
  • 1355 OC Mode Clock (MHz)
  • 14 nm Chip
  • 2304 Stream Processors
  • Video Memory: 8GB size, 256-bit GDDR5, 8000 MHz effective
  • Weight: 1.9 lbs


I think that the Helios FX 650 is a very nice option for enhancing your computing power without having to purchase an entirely new system. I do wish that I had a clearer picture of why the GPU we chose ended up not being consistent with results but I’m happy with the results I did get. For someone who really wants to step up from a basic system to a more advanced one, the Helios FX 650 is a great way to go. While it wasn’t that great of an improvement for the 2018 MacBook Pro (because of the upgraded internal GPU), it was ideal for the 13-inch 2016 MacBook Pro.




Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store



Mac Sources is an Information and Technology Company. We review all things technology-related. Our team also reports on tech news happening in the world. 