4 BC250 10" Rack Mount

ASRock BC250 Quad Mounting System for 10" Rack

This is a complete mounting system designed to install four ASRock BC250 mining boards inside a 10-inch rack.

Important: A standard 10" rack is not deep enough to accommodate BC250 boards due to their length. My solution uses the front and rear frame of a LabRax rack, combined with custom extended crossbars, which are included in this design.

The mounting system splits the four boards into two independent pairs. Each pair is cooled by a single 120 mm fan, providing a compact and decent airflow solution.

I personally use an Arctic P12 Pro 3000 RPM fan for each pair, configured to run at 100% speed at all times, which has proven sufficient to keep the boards decently cooled for my use case, even if the thermal performances are not amazing.

Assembly Instructions

Assembly is not particularly beginner-friendly and may require an extra pair of hands. It is also important to follow the assembly sequence below.

1. Assemble the rack frame

Install the front and rear rack frames and connect them only using the lower crossbars.

I recommend installing the BC250 system in the upper rack position, so this is also the right time to install any other equipment that will occupy the lower space.

In my setup, I installed:

• a network switch

• a 1000 W power supply dedicated to the BC250 boards

2. Install the rear fan assembly

Attach the 120 mm fans to the rear mounting brackets.

Then insert the entire rear assembly from inside the rack.

Important: Both the fan assembly and the rear boards support must be installed from inside the rack, not from the outside.

3. Install the front support

Mount the front support bracket to the front rack frame as usual. This is also a good time to mount the power switch in the dedicated mounting hole on the lower part of the front frame. 

4. Install the fan duct

Snap the fan duct onto the pair of BC250 boards.

Take extra care around:

• the motherboard header pins

• the CMOS coin-cell battery

These parts are close to the duct and can be damaged if excessive force is used.

5. Install the boards

Carefully slide the two assembled boards into the rack from the top.

Because of the tight tolerances, you may need to slightly spread the rack sides during installation.

I also recommend loosening the lower crossbar screws slightly before inserting the assembly. This provides a bit of extra flexibility and makes installation significantly easier.

Once everything is in place, tighten all screws.

Printing

All parts are designed to fit on a 220 × 220 mm print bed by placing the longest components diagonally.

I printed everything on an Ender 3 S1 Pro.

The entire assembly was printed in PLA+, and I have not experienced any heat-related deformation during operation.

For best results:

• Use multiple wall/perimeter layers for increased rigidity.

• Use a high infill percentage for the support brackets so they do not flex under the weight of the BC250 boards.

• No special materials are required—PLA+ has been perfectly adequate in my experience.

If you build it, I'd love to see your setup! Feel free to post a make or suggest improvements if you find a better way to assemble or cool the system.