DIY Local 2x DGX Spark cluster cooler with automatic temperature controlled fan.

I’ve found that DGX Sparks can get pretty warm when you cluster them together. You are forced to keep them close together because the ConnectX-7 cable made for these is extremely short )like less than a foot).

I have both a DGX Spark Founder’s Edition and a GIGABYTE AI TOP Atom (Spark clone).I decided I wanted to add some active cooling to the cluster so I found cooling case plans for a 2 Spark fan case that someone posted to Thingverse:

https://www.thingiverse.com/thing:7355793

A friend of mine 3D printed it for me in PETG filament which he said was better for higher temperature applications than standard PLA.

The cooling enclosure has space for 2 Sparks (or Spark clones) plus a removable shelf in the middle that leaves a gap between them for air flow. The front of the case has space for a 120mm x 120mm x 25mm fan. It also has two retention rods that slide into place to keep the Sparks from sliding out the back of the enclosure.

I wanted the cooling fan to be automatically thermostat-controlled, so I bought an AC INFINITY fan controller that has a temperature probe. This controller is normally used for adding cooling to home theater rack enclosures or grow boxes for “hydroponics” (wink, wink), but I thought it should work of in this application as well.

AC Infinity Controller 2:
https://www.amazon.com/dp/B00NG9TSG4?ref=ppx\_pop\_mob\_ap\_share

I can set a maximum temp that will trigger the fan to come on, and the unit will adjust the fan speed as needed based on the probe temperature feedback.

I chose an AC Infinity MULTIFAN S3 USB fan (https://www.amazon.com/dp/B00G05A2MU?ref=ppx\_pop\_mob\_ap\_share) because it was made to pair well with the fan controller of the same brand. Noctua also makes a USB fan, but it is only available in that ugly-as-shit brown color that they make.

I’ll probably build a separate enclosure for the fan controller since it has mounting holes and is meant to be recessed mounted into furniture.

I literally just finished the build this morning, so I haven’t run any performance tests on it yet but I will definitely do that at some point soon if anyone expresses interest in knowing that kind of information.

The fan controller was $50, the fan was $15, and my friend said the 3D print consumed about 3/4 of a $20 spool of PETG filament. So about $80 for all the parts.

One question I had for all the cooling gearheads out there: Right now, I have the fan pointed in the direction where it’s pulling air from front of case and blowing it through the Sparks towards the back. Is that the proper direction for the fan orientation for this situation or should I have it the other way around?