The PC may restart or fail to boot only occasionally and unpredictably?
The PC may restart or fail to boot only occasionally and unpredictably?
My PC occasionally boots but often doesn't work properly. Usually it lacks video output and USB functionality, then shuts down immediately when I press the power button. I've tried various troubleshooting steps from forums, but nothing seems to help. I recently replaced another PSU, yet the same problems persist. I already had the same model before, so it didn't make a difference. I purchased the identical PSU because my previous one was working fine for a long time, it was cheaper, and I wasn't sure if the PSU was actually the issue, so I didn't want to spend much on it. Others have reported similar problems—some say a better PSU fixed it, while others say a new one didn't help. Was choosing the same wattage and model a mistake?
The CX series are what I refer to as "low-end" power supplies. I seldom use CX and only in builds that aren't frequently utilized. For a 3080 GPU, I would have chosen an RM850, maybe even an RM1000. A better design, greater power headroom for the GPU, and a longer warranty.
It's clear that any remaining issues in the setup could be due to an undiagnosed problem. Whether the fault lies with the system or the power supply isn't certain until a different PSU is tested. I would expect the system to start up using a 750W power supply, but I'm unsure about the maximum current spikes generated by the GPU and CPU during the initial boot into Windows. Yesterday I performed a power test on a machine equipped with a 750W PSU, an average wattmeter reading, and when the Windows desktop loaded, the power draw rose from 170W to 250W for a short period. For the 7950X, RTX 3060, and RM850 PSU. I'm currently doing video transcoding and the wattmeter reads 399W continuously. At idle, the system consumes 135W. High-end GPUs such as the 3080/90, 4080/90, and 5080/90 require significant short-term current surges (lasting milliseconds) beyond any average power measurements. https://forums. This review notes that the 3080 can handle up to 320W and suggests a PSU with at least 700W capacity. https://www.techpowerup.com/gpu-specs/ge...3080.c3621 I'm uncertain if the 320W figure accounts for overclocking enabled via MSI Afterburner, but with a basic 750W PSU like the CX750, it may not be able to supply the necessary short bursts of high current required by the GPU and CPU. That's why recommendations often point to more robust PSUs with extra capacity. Do you own a CX750, CX750M, or CX750F? I believe the F and M models come with modular cables.
The model I swapped in was CX750M, which is modular. I switched it to the CX750.
I had been using the card on the CX750M for a long time without any problems, even with OC settings. Recently, I upgraded the motherboard, CPU, and RAM, but it still works well for over a month.
Sadly, the model lacks integrated graphics. It's curious how the keyboard LEDs illuminate as if it were booting without the 3080, suggesting a potential GPU problem. However, it seems to start up reliably once the 3080 is present, which makes me think there might be an issue with the GPU itself. I'm planning to test my brother's lower-end AMD GPU tomorrow to see how it performs.