If you were in or around the PC building space in 2020, you'd have at least heard about the fire risk related to the PCIe riser cable on the original NZXT H1 mini ITX case, which eventually resulted in a recall and replacement PCIe riser kits being sent out . Since NZXT has launched the newest iteration of the SFF case, the H2 Flow—which TechPowerUp has reviewed —the PC case maker has seen fit to publish a blog post explaining the engineering changes it has made to the new H2 Flow's riser cable to avoid the same issues from popping up again. NZXT starts things off by reminding us that the problem with the original H1's PCIe riser cable was that the mounting screw made contact with an internal power plane in the riser cable's PCB, resulting in a short circuit that could lead to a fire.

The brand goes on to explain that the issue has been avoided in the new PCIe riser cable with two safety measures. First, there is a physical boss, or "shoulder" that extends into the PCB through-hole to protect the PCB from the screw threads and to ensure that there is a consistent and guaranteed gap between the screw and the PCB. Secondly, NZXT has changed the design of the PCB such that there are no power planes or traces surrounding the screw hole—every trace around the screw is grounded, and that ground plane extends externally to a copper screw pad on the top and bottom of the PCB, adding another layer of protection. NZXT notes that the screw pad may be missing in some early review samples, which is something you can observe in our review of the H2 Flow, but it is included in the final mass production versions of the case. NZXT claims that these measures have eliminated the failure mode that caused issues with the original H1 chassis.