Free Guide to Understanding Computer BIOS Updates

What Is a BIOS and Why It Matters

BIOS stands for Basic Input/Output System. It is the foundational software that runs on your computer before your operating system—whether Windows, Mac, or Linux—starts up. Think of it as the instruction manual your computer reads the moment you press the power button. The BIOS controls how your hardware components communicate with each other and with your operating system.

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Your BIOS sits on a small chip on your motherboard, the main circuit board inside your computer. This chip stores the BIOS program even when your computer is powered off, thanks to a small battery that keeps it charged. Every time you start your computer, the BIOS performs what is called the "power-on self-test" or POST. During this test, it checks that all your hardware—your RAM, hard drive, graphics card, and other components—are working correctly.

The BIOS also manages basic settings that affect how your computer operates. These settings include the order in which your computer looks for a device to start from (called the boot order), the date and time, and how much RAM is available. Some BIOS versions even let you control fan speeds and CPU performance settings. In newer computers, a program called UEFI (Unified Extensible Firmware Interface) has replaced traditional BIOS in many cases, though people often use the term "BIOS" to refer to both.

According to hardware manufacturer statistics, approximately 70% of computer users never update their BIOS after purchasing their machine. However, BIOS updates can provide important benefits. Manufacturers release updates to fix bugs that may cause crashes, improve compatibility with new hardware, or close security vulnerabilities. For example, Intel and AMD released critical BIOS updates in 2018 to address the Spectre security issue, which affected millions of computers worldwide.

Practical takeaway: Your BIOS is the lowest-level software on your computer. Understanding what it does—controlling startup, managing hardware communication, and storing system settings—helps you recognize why updates matter.

Understanding Why Manufacturers Release BIOS Updates

Computer manufacturers and motherboard makers release BIOS updates for several documented reasons. The most common reason is to fix bugs—problems in the original code that cause unexpected behavior. These bugs might make your computer crash when you use certain programs, prevent recognition of new hardware, or cause random freezes. When engineers discover these problems, they write fixes and release them as updates.

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Security is another major reason for BIOS updates. Because the BIOS runs before your operating system, it has very low-level access to your hardware. If a security flaw exists in the BIOS, it can potentially be exploited by malicious software that operating system security features cannot detect. Major security vulnerabilities discovered in BIOS code have affected billions of devices. For instance, the Meltdown and Spectre vulnerabilities discovered in 2017 required BIOS patches across virtually all modern processors, and security researchers continue to identify new BIOS-level vulnerabilities regularly.

Hardware compatibility represents a third reason for updates. When new components become available—faster RAM, new processors, or different storage devices—the BIOS may need updating to recognize and work with them properly. Manufacturers test their BIOS with new components and release updates to ensure compatibility. This means that a computer model released in 2020 might need a BIOS update in 2023 to work optimally with newer RAM technology or processors.

Performance improvements are a fourth reason. Some BIOS updates optimize how your system manages power, allocates processor cores, or manages memory. These updates might improve battery life in laptops, reduce heat generation, or increase processing speed slightly. Dell and HP report that users who stay current with BIOS updates experience fewer system crashes and longer hardware lifespan on average.

Additionally, manufacturers update BIOS to address specific issues that affect subsets of users. For example, if a particular combination of motherboard, processor, and RAM causes problems, manufacturers may release a targeted update. Gaming-focused motherboard makers frequently release BIOS updates to improve performance in specific games or with specific graphics cards.

Practical takeaway: BIOS updates address bugs, security issues, hardware compatibility, and performance. Knowing these reasons helps you assess whether an update is worth performing.

How to Identify Your Current BIOS Version

Before considering a BIOS update, you need to know which version your computer currently has. The process differs slightly depending on your operating system, but the information is always available on your machine.

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On Windows computers, the simplest method is to use the System Information tool. Press the Windows key and type "System Information" into the search box, then open the application. In the window that appears, look for "BIOS Version/Date." This line shows both your current BIOS version number and the date the BIOS was released. The version number typically looks like "American Megatrends Inc. N.XX.XX" or similar, depending on your motherboard manufacturer. The date might show something like "03/15/2022," indicating when that particular BIOS version was released.

An alternative Windows method involves opening Command Prompt as administrator and typing the command "wmic bios get smbiosbiosversion" and pressing Enter. This displays your BIOS version in a simple format. Some users find this faster than navigating through multiple windows.

On Mac computers, click the Apple menu, select "About This Mac," and look for "Boot ROM Version" or "System Firmware Version." This information tells you your BIOS equivalent version. Apple updates this differently than Windows manufacturers, and the numbering system looks different, but the purpose is identical.

For Linux users, open a terminal and type "sudo dmidecode -t bios" and press Enter. You may need to enter your password. The output displays your BIOS vendor, version, and release date clearly. Some Linux distributions also display this information in system settings panels.

Once you have your current BIOS version and date, visit your computer or motherboard manufacturer's support website. Search for your specific model number—found in System Information under "System Model." Look for a downloads or support section and search for BIOS updates. Manufacturers typically list all available versions with release dates and descriptions of what each update fixes.

Practical takeaway: Finding your current BIOS version takes less than five minutes and is essential before considering any update. Use System Information on Windows, About This Mac on Apple devices, or terminal commands on Linux.

Evaluating Whether You Need a BIOS Update

Not every BIOS update is necessary for every user. Deciding whether to update requires understanding what each update addresses and whether those issues affect your situation. This assessment prevents unnecessary updates that carry minimal risk but also require your time and attention.

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Start by reading the release notes for available BIOS updates on your manufacturer's website. These notes, often found next to the download link, describe what each update fixes. Release notes might say something like "Improves stability with DDR5 memory," "Fixes random shutdown issue," "Updates security microcode," or "Improves performance with RTX 4090 graphics cards." If the release notes mention a specific problem you experience, that update likely benefits you.

Consider your computer's age and hardware. If your computer is very new—less than a year old—staying current with BIOS updates may provide value as manufacturers often discover and fix issues during a product's first year. However, computers that are several years old and running without problems may not benefit from updates addressing newly discovered features or hardware that doesn't apply to your system.

If you experience specific problems—frequent crashes, games not running properly, or new hardware not being recognized—check the BIOS release notes to see if an update addresses your issue. This is the clearest sign that an update is worth performing. Conversely, if your system runs smoothly and the release notes describe updates for features or hardware you don't use, the update becomes optional.

Security updates deserve special consideration. When manufacturers release BIOS updates specifically labeled as addressing security vulnerabilities, these usually warrant updating. Security vulnerabilities can potentially be exploited even if you haven't experienced problems. However, understand that typical home users face lower risk than businesses or government agencies using high-value systems. A personal computer with basic security practices is less likely to be specifically targeted.

Timing matters when making this decision. BIOS updates go most smoothly on computers without other problems. If your system is currently unstable or you