Review on Ubit 6-Pack GPU Riser Express Cable 16X to 1X (6pin / MOLEX/SATA) with LED Graphics Extension | Ideal for Ethereum ETH Mining | Powered Riser Adapter Card by Michael Cleveland

Products have a very high defect rate. I bought these items knowing they could have a high defect rate because who knows if I had 6 and 2-3 were defective I could still use working ones and Revain's excellent returns policy would help. I'm currently building 6 GPUs and these things are pretty easy to install, there's really only one way to install them. I started the installation by installing two GPUs. I left them overnight to test stability. One was fine, the second GPU had a lower hash rate (seems to be mentioned as a defect here and there as well). The next evening I proceeded to install 4 more GPUs. When powering up the rig I heard a crackle and saw sparks and some smoke coming out of the GPU. The LED indicator on the riser itself did not light up. I immediately switched off the computer and initially attributed it to the defective GPU. So, without hesitation, I replaced the riser under the sparkling GPU with a known-working GPU. Very stupid of me, but I thought I hadn't read anywhere that adapters burned the GPU and I wanted to make sure the adapter worked. I turn the rig back on and sparks and smoke come out of the GPU. Catastrophic Failure #2. Good. I now know it was the riser that destroyed the GPU. What about the other two GPUs? Well, when the unit turned on, I noticed that the fans would spin up for a few seconds and then both stop. I then unplugged the GPUs and plugged them directly into the PCI slots. None of them turned on and Windows couldn't detect it. This is a likely victim of climbers. Although I didn't disassemble the GPU, I didn't see any visible burn marks on the board from the outside. I understand MFR is in a rush to launch these parts due to the crypto mining boom. These parts appear to have worked great in the past, but it's possible this is a new batch that someone somehow hasn't tested for quality or safety. To me, a misaligned/faulty pinout or improper PCB connection could be the likely culprit. While these risers are considered "low-voltage" parts, they still send around 75W of power to the GPU, which is enough to kill everything. I have contacted MFR to discuss next steps to resolve the issue. Unfortunately, I was told that this was due to an incorrect installation. In fact, they told me to grind the sand. This is also very unlikely as there is really only one way to connect them. Also, I've built dozens of computers for various companies in the past, so that doesn't mean I don't know what I'm doing. I'm still trying to figure out what to do with $1600 brick GPUs. Maybe I'll file it as a "service request" to see how they diagnose the problem as :(