My brother has ordered the Ryzen 5950x with an ASRock x570 Taichi board, 32gb ram, a new m.2 ssd and a Corsair RM850x for his new build, and we've started building the system today. He already had the GPU and some SSD's and the rest is new.
I noticed something was off with the 4 pin female CPU power connector next to the 8 pin connector on the board, it was turned 90° to the left. I own the exact same motherboard and on my board it's in the same orientation as the 8 pin.
Now the next part might be a bit stupid, but I was assuming that they may have had a good reason to change the orientation of the connector. It never crossed my mind that it was a mistake, so we continued with the build.
After finishing everything and connecting a monitor, mouse and keyboard I switched the PSU on and the motherboard lit up with the RGB. I pressed the power button and all that happened was a mild click from the PSU and nothing else, the RGB was still on. First I thought it had something to do with the bios being too old for the 5950x, but that click and no number/code on the led display made me think twice. I disconnected the 4 pin cable leaving only the 8 pin connected and it booted without a problem.
Here is a picture from both the 8 pin and the 4 pin connector.
If the connections under the connector are the same as on my board, it will directly short 12v to GND. That's why the PSU was clicking and nothing happened (let's hope so).
After removing the 4 pin and leaving only the 8 pin connector installed I checked the CPU and RAM in the bios, everything was up to spec. If anyone has an idea what would be a good test once we've rebuild this system to make sure that nothing has happened to the CPU and RAM, please let me know. I personally think that everything should be okay, because there was a direct short between the 12V and the GND on the GND "rail", but just to be sure...
We installed his GPU and other SSD's back into his old pc, and we'll return the board as soon as possible.