Installing an ATX MB + ATX PSU in the Meshroom S V2: A Step-by-Step Guide

Overview This guide shows you how to install a standard full-size ATX motherboard and ATX power supply into the compact Meshroom S V2 chassis. Note that this setup only supports Small Form Factor GPUs up to 239 × 160 × 63 mm (LxWxH).

1. Choose the PCIe Riser Cable Select the appropriate cable length based on your motherboard form factor (mATX or ATX). 

2. Prepare Accessories
   1. Power‐supply extension cable
   2. Copper standoffs: 2 × 25 mm, 3 × 15 mm (spares included in accessory box)

3. Remove Pre-installed Riser If your chassis shipped with a pre-installed GPU riser, remove the riser bracket and cable.
4. Detach Excess I/O Ports Remove the USB ports from the motherboard I/O shield area to clear routing space.

5. Mount the GPU Riser Using two #6-32 screws and two 25 mm standoffs, secure the riser bracket to the top of the chassis.

6. Pre-install CPU Install your CPU and its retention bracket on the motherboard before mounting the board into the chassis.

7. Install Motherboard Secure the motherboard using five #6-32 screws and 6.5 mm standoffs, ensuring all ports align correctly.
8. Attach PSU Standoffs Mount three 15 mm copper standoffs onto your ATX power supply for chassis mounting.

9. Route Extension Cable Feed the PSU extension cable through the bottom cable pass-through, then route it neatly to the top.
10. Secure the PSU Fasten the power supply inside the chassis using three #6-32 screws.

11. Reinstall GPU Bracket Secure the GPU into the riser bracket with two #6-32 screws.
12. Install CPU Cooler Ensure your cooler’s width does not interfere with the mesh top panel; adjust standoff heights if necessary.
    1. CPU cooler clearance: Varies by bracket height—refer to diagram on p. 33–34 of the manual.
13. Optional: Mount 3.5″ HDD The lower side panel houses a 3.5″ drive bay for additional storage.