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7.  Insert the PCIe card into the assembly through the top or side, 

depending on the card length. The shroud design for some 
full-length cards may require you to install the card from the side 
(shown at right), and possibly remove the main fan temporarily in 
order to insert the card into the chassis.

8.  Line up the connector on the card with the PCIe slot, then lower 

the card into the slot and apply gentle downward pressure to 
fully seat the card. 

IMPORTANT:

 do not rock the card when 

installing it and do not force the card into the slot if you feel 
resistance. Remove the card, check for obstructions, then 
carefully re-align the connector on the card and the PCIe slot, 
and try again.

9.  If necessary connect one or both of the auxiliary power cables 

to the card. Check the PCIe card’s documentation to determine 
if auxiliary power is required and if so, which type of connectors 
are recommended. 

10. Secure the PCIe card bracket (and PCIe slot cover if you 

installed a single-width card) using the Locking Plate and 

screws that were removed in Step 4. The card’s bracket should 

be ‘sandwiched’ between the base of the Locking Plate and the 
plate itself, before the bracket is affixed using the two Phillips 

screws and the thumbscrew shown at right.

11.  Pull the sides of the top cover apart slightly then lower it onto 

the inner chassis’ top brackets. Push the sides toward one 
another so that the guides on the cover and the inner chassis 
engage. Once this is done, slide the top cover all the way 
forward until it stops.

12.  Secure the top cover to the inner chassis with the three 

thumbscrews you removed in Step 2. 

13. Connect the included AC power cable to the Mercury Helios FX 

and then connect the other end to a wall outlet or power strip. 

NOTE: 

the Power LED on the front cover will not light up until 

the computer is powered on, but the LEDs inside the unit will 
light up anytime it is receiving power. Last, connect the included 

Thunderbolt 3 cable from the host computer to the Mercury 
Helios FX. 

This completes the assembly process.

Installing The GPU Driver

IMPORTANT:

 not all PCIe cards require a driver, but all supported GPUs require the installation of a Thunderbolt-certified driver in 

order to operate normally. Please consult the GPU manufacturer’s documentation to verify driver availability for Mac or PC. Once 

you’ve verified drivers are available, download them and follow the manufacturer’s instructions for installation. For macOS 10.13.x, 
some drivers are provided with the operating system, such as for the AMD Radeon RX 580 card and other cards in that series.

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