Help with PC Crashing Issues Using a 5090 and 14900KS

Have you considered disabling hyperthreading and testing with fewer cores running? I found that setting my CPU to only use 8 E-cores with an adaptive offset really helped with stability in gaming. Just a thought! You might also want to check your BIOS version.

When you say it's crashing, do you mean it shuts off completely? The 1000W might be too low for your configuration, especially if you're also using demanding apps or games. I experienced similar issues before upgrading to a 1500W PSU, and it completely resolved my black screen problems. Definitely worth the upgrade if you’re running a powerful setup!

Is your motherboard up to date? Sometimes compatibility issues can cause odd crashes, especially with newer CPUs. Ensure you have the latest BIOS version, and that could help improve stability.

It sounds like your current setup might be pushing the limits of your 1000W PSU. The 14900KS can draw significant power, especially under heavy loads, and combined with the spikes from the 5090, you might be hitting that ceiling. I have a different setup but faced similar power issues and switched to a 1200W supply without any trouble. Just make sure the new PSU is from a reputable brand, and you should be good to go!

Make sure you share your full system specs, including RAM timings and any connected devices. This can help us pinpoint the issue. Also, what do you mean by "crashing"? Does it just shut off, or do you get a BSOD? More details will help us assist you better!