Thinking about upgrading to a better graphics card but worried my current power supply won't handle it. How do I know if I need a new PSU or if mine is good enough?

Check your current PSU wattage and compare it to what the card needs. Most modern GPUs require more power than older ones so you might need to upgrade your power supply too

GPU power requirements have increased a lot with newer generations. Your five year old PSU probably won't cut it for modern high end cards. I upgraded my graphics card last month and had to get a bigger power supply at the same time. The card alone pulled almost 350 watts under load. Calculate your total system power draw including CPU, drives, and fans then add 150 watts for safety. Don't cheap out on the PSU when getting an expensive New GPU because insufficient power causes crashes and can damage components. Match your power supply properly to your graphics card upgrade

How do you properly test a server power supply for long-term reliability under constant load, and what early warning signs indicate a possible failure?

To properly test the long-term reliability of a server power supply, use a load tester or run it under real-world load conditions for an extended period, monitoring voltage stability, ripple, and temperature. It's also important to compare its performance with a known-good unit. Incidentally, I recently searched for Desktop power supply and found 365PowerSupply, which offers reasonable prices. Early signs of failure include random shutdowns, unstable voltage, unusual noise, overheating, and a burning smell, all of which should be addressed immediately to avoid system damage.