The power supply unit (PSU) is the backbone of your gaming PC, providing reliable power to every component. But as time goes by, even the most durable PSUs can start to wear out. Knowing when it’s time to replace your PSU can save you from unexpected shutdowns, performance issues, and even costly repairs. Let’s go over three signs that your PSU might be on its last legs—and what you can do about it.

1. Random Shutdowns or Restarts

One of the earliest signs of a failing PSU is unexpected shutdowns or restarts, especially during power-intensive activities like gaming. If your PSU can’t consistently supply the wattage your components need, your PC might shut down as a safety precaution. This is especially noticeable if you’re gaming on resource-hungry titles like Cyberpunk 2077  (minimum spec: Intel Core i5-3570K, 8GB RAM, GTX 780) or Elden Ring (minimum spec: Intel Core i5-8400, 12GB RAM, GTX 1060).

To troubleshoot, compare your PSU’s wattage with the power demands of your system’s components. PSU calculators, such as the one from Newegg, can help you see if your current power supply is sufficient. If it isn’t, upgrading to a higher-wattage PSU may resolve the issue.

2. Strange Noises and Overheating

Unusual noises, like buzzing or rattling from your PSU, are another major red flag. This could be due to failing components inside the PSU or debris buildup in the PSU fan. Overheating is also a major concern—it can cause thermal shutdowns or even damage your PC’s internal parts.

A well-functioning PSU should run relatively quietly. If your gaming setup requires high-performance cooling, consider upgrading to a high-efficiency PSU (such as one with an 80 PLUS Gold or Platinum rating). This reduces energy waste and heat output, helping keep your system cool and quiet. If you’re looking for cooling solutions, check out our Lithgeek Online Store for top-quality options Lithgeek Online Store.

3. Performance Issues in Games and Programs

A failing PSU can also cause performance issues, such as lag, stuttering, or inconsistent frame rates in games. This can happen because the PSU is unable to provide a steady power supply, causing performance drops in games like Fortnite (minimum spec: Intel Core i3-3225, 4GB RAM, Intel HD 4000). When your PC doesn’t receive stable power, it may throttle performance to prevent system crashes.

If you’re experiencing these issues, start by checking other components (like your CPU or GPU) for potential bottlenecks. But if your system is frequently lagging, your PSU could be the underlying problem. Upgrading to a new, more reliable PSU can restore smooth performance, especially if you’re running a mid- or high-end GPU that needs a stable power supply.

When It’s Time to Replace Your PSU, Lithgeek Has You Covered

At Lithgeek, we specialize in custom-built gaming PCs, and we’re here to recommend the perfect PSU for your gaming needs. Based at 53 Main Street, Lithgow, we serve areas throughout the Blue Mountains and beyond, including Bathurst, Katoomba, and Springwood. We carry a range of power supply units and other high-quality components in-store and online.

Looking to maximize your PC’s performance? We also offer services like overclocking, gaming rig optimization, and PC cooling solutions—everything you need to keep your gaming setup running at its best. From PSU upgrades to fully customized rigs, Lithgeek is your local destination for all things gaming.