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Old 12-04-2019, 10:03 PM
Yumi Yumi is offline
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Default RM850x GPU compatibility? + other questions

I've been running a Cooler Master RealPower 550W power supply in my PC, which I just replaced with a new Corsair RM850x, but am having a few issues.

When I first plugged everything in, the system would power on but not boot. My GPU (Sapphire RX570) needs an 8-pin connector but has an optional 6-pin, both of which I had connected. I tried disconnecting the 6-pin and the system booted fine.

The next day, the system wouldn't boot. If I disconnect the 8-pin on the GPU, the system does boot, but there's no video output (obviously). Plug the 8-pin back in, and the same thing occurs - power but no boot.
I've tried unplugging harddrives, as well as plugging the 8-pin PCIe port (PSU side) into a different modular slot, but it doesn't make a difference - if the GPU is powered, it won't boot. I've even tried using a 4-pin molex in the PSU, with a 2x molex to 8-pin PCIe adapter (which I had to use on the old PSU because it didn't have 8-pin PCIe power), and it didn't work.

To see whether the GPU has had something odd happen, I plugged the old PSU back in, and the system boots with the GPU powered on.
So, it seems that the RM850x doesn't like the GPU for some reason. I've never really heard of a PSU<->GPU incompatibility (other than not enough power or connectors), but does anyone know what could be the issue?


Also I noticed that when the system powers on/off, there's a click noise from the PSU. It's just a once-off and doesn't seem to be indicative of an issue, but I've never seen a PSU which does this, so am wondering: is this normal?

Another thing, when I tried turning off the PC on the first day, after powering down, it immediately turned itself on again. Repeated the process and confirmed that it isn't just a once-off thing. As such, I had to turn it off at the switch to prevent the PC auto powering itself on. Would the PSU be tripping on something, causing this behaviour?

Thanks for reading!
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