Installation and Finished Product
After sliding the corner bits inward to align with the LGA115X motherboard holes, we first installed the backplate. Outside of the threads in the corner bits, the entire plate is made of plastic, so that there is no chance of damaging the motherboard or shorting out against a component.
After flipping the motherboard over, we took the LGA115X standoffs and screwed them into the backplate. There are no washers here, but the standoffs run out of threads before the standoffs make contact with the motherboard.
The next step is to mount the head unit to the hardware, but we made sure to apply MX-2 since we removed the factory paste. The thumbscrews should be installed in an X-pattern to keep the pressure even, and you tighten these until you run out of threads. We also routed the 4-pin PWM wire for the head unit and routed the 3-pin ARGB cable so it would cause the least issues and be near invisible in the chassis.
Rather than take a bunch of images of how the head unit is taller than the RAM, or how it does not interfere with the RAM in any way, or how access to everything around it is unimpeded as well. We feel this image, and what follows shows all of it.
Before we attached the radiator to the chassis, we went ahead and did a bit of wire management with the fan cables. We were able to fit both of the sleeved 4-pin fan wires in here, and we could fit more if needed, should you want to try to clip in the ARGB cables as well. The instructions do not specify their installation, so use them as needed.
The gap between the top of the D-Frame and the motherboard is more substantial than almost any chassis out there, and we had no issues reaching with 400mm of the tube, and with swivel and rotary fittings, should the bends be more aggressive, both ends of the tube will adjust to relieve stresses. For those of you without ARGB control from your motherboard, this is the end of the road, unless you have another form of ARGB control. Fractal offers nothing for those on older systems without that feature.
Since our motherboard does not offer ARGB support, we dug into a box from another cooler and borrowed the ARGB hub from it to show the potential of the S28 Prisma. Doing so has a ring of color now shining from around the head unit, and both fans match the pattern we see on the head unit.