Recently I've finished building new PC which uses brand new AX1200i PSU - basic system spec below. After finishing the build I have installed OS and did some full load test (both GPUs and CPU stressed using Prime95 + FurMark). After that I've continued using this PC without any problems for about week.
I didn't change anything related to the hardware and didn't have any spare time to install more software either, the only difference I can remember is that the OS (Windows 10 64-bit Pro) got updated from version 1809 (the one I've installed) to 1903. Anyway next the the random shutdowns started. It looks like that: PC is running IDLE or near it (like browsing web or something like that, no heavy load on CPU or GPUs), and there there goes a random shutdown - status light on the PSU goes from green to red, PC power light is still on (now that's odd) but everything else like case fans are off. Power button can not be used to turn the PC on again. I have to use the power switch on the PSU to turn it off, wait few second and now I can use the PC power button to turn it on again. Yet if I do so, it runs for about 1 second, shut downs again including status light on the PSU going red. After waiting for about 10 to 25 minutes (this amount of time is a bit different every time) I can turn the PC on normally.
The PSU is connected using dongle and internal USB 2.0 hub to the motherboard 2.0 only one internal port. I've got Link software (latest version) installed and I believe I was able to notice the reason of those shutdowns.
The total power consumption while IDLE is about 200 W of which about 180 W is consumed using 12 V voltage. I've got it running in multi-rail mode with no custom over-current protection setting for each output. Only one of the outputs (CPU/GPU output #4) is reporting any current consumption (it seems that anything below 5 A is showing as 0 A so there is some other small consumption on other outputs too) of about 5 A. I believe since this equals 60 W it must be the one powering the main GPU, as it should IDLE near this power level. This current consumption changes between 5 A and 6 A from time to time, but after 10 to 20 minutes it steadily starts going up. After few seconds the reading is 8 A, next 12 A, 17 A and then it goes crazy with 3 consequent readings going something like: 27 A, 45 A, 59 A and there goes the shutdown. What is odd the total power consumption on the 12 V voltage and the total power consumption of the PSU does not go up at all. All the temperatures of CPU and GPUs are not increasing in any unusual way either.
So it seems there is a malfunctioning device connected to the CPU/GPU output #4, right? Assuming that the numbers in Link software corresponds to numbers below the PCIE cabling connections of the PSU it would seem that CPU/GPU output #4 is the 6-pin cable powering my main GPU. This GPU has also additional 8-pin plug connected to the PSU CPU/GPU output #5. To test this without removing all the cabling from the back side of my case I have connected my last unused CPU/GPU output (#7) using new cable going directly to the 6-pin socket of the main GPU. Guess what - current consumption on output #7 is 0 A while on output #4 it is still 5 A by default, next it increases slowly and the random shutdowns continues.
Any ideas? I'm not sure is this a case of faulty PSU (and there are a lot of reports here on random shutdowns of AX1200i model) or not.
Basic system specs:
- CPU -AMD Ryzen 7 3800X,
- GPUs - 2 x Sapphire Radeon 5700 XT Pulse,
- MB - Asus TUF X570 Plus,
- CPU AIO cooler - Corsair H115i Pro,
- 1 x M.2 SSD, 1 x SATA SSD, 4 x SATA HDD.