I just built a new PC, and it worked fine without a GPU. But when I connected my graphics card, I heard a loud pop from the power supply. This is my second time building a PC; I built one 8 years ago with a 1080 and Ryzen 1700. I was confused about the 12vhpwr cable for the 5080. Instead of using a cable with 12v on both ends, I used one that had two PCIe on one end and 12v on the other. I plugged the 12vhpwr into the GPU and one PCIe into the power supply. After that, the PSU made a quiet noise and the GPU lights flickered, but nothing else happened. I then tried powering it on using just the CPU with integrated graphics, and that worked fine. Thinking I needed both PCIe cables plugged in for the GPU, I did that, and when I turned it on, there was a huge pop and now the system won't power on at all. The PSU is under warranty, so I'm not too worried about that, but was it necessary to use a 12v to 12v cable? The PSU is a brand new 1000W unit that I bought just a week ago.
2 Answers
It sounds like you may have connected the cable incorrectly. The pinouts for PCIe power cables vary between PSUs, and using a mismatched one can cause serious damage, possibly frying your PSU and GPU. If the cable was from another PSU, that's a definite red flag. It's great that the PSU is under warranty, but just make sure to check if other components are affected too.
You should definitely stick to using a 12v to 12v cable for your new GPU. Mixing up power cables can lead to situations like this. Since your PSU is under warranty, you're probably fine there, but let’s hope your other parts are intact. Do you have details on your components? It might help to diagnose any further damage.
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