How to Change the Size of Shared System Memory in Windows 10

Adjusting shared system memory in Windows 10 allows integrated graphics to access more RAM for better performance. This setting is configured within the BIOS or UEFI firmware interface rather than through standard Windows operating system controls. Modifying this value can resolve graphical glitches and improve rendering speeds on systems lacking dedicated video cards.

Understanding Shared System Memory

Integrated graphics processors, often found on motherboards with Intel HD Graphics or AMD Radeon Vega cores, do not have their own dedicated video memory. Instead, they utilize a portion of your computer's main system RAM as video buffer. This allocation is known as shared system memory. By default, Windows and the motherboard manufacturer set a conservative limit, typically ranging from 64MB to 512MB, depending on the total installed RAM and hardware capabilities. When you run graphically intensive applications, such as modern games or video editing software, the integrated GPU may request more memory than the default allocation provides. If the limit is too low, you might experience stuttering, low frame rates, or application crashes. Increasing this limit ensures that the graphics processor has sufficient resources to handle complex visual tasks without constantly swapping data between the CPU and GPU. For users experiencing performance issues in specific titles, it is worth noting that some applications have internal settings that also dictate memory usage. You can check out Troubleshooting: Unable to Adjust Graphics Settings for Better Performance in HITMAN 3 to see if game-specific configurations are contributing to your performance problems before altering system-level settings.

Accessing the BIOS or UEFI Interface

To change the shared memory size, you must restart your computer and enter the firmware setup utility. The process varies slightly depending on your motherboard manufacturer, but the general steps remain consistent across most devices. First, save any open work and restart your PC. As the computer begins to boot, watch for a message on the screen that indicates which key to press to enter Setup. Common keys include Delete, F2, F10, or Esc. You may need to press the key repeatedly immediately after powering on until the BIOS screen appears. If your Windows 10 system uses Fast Startup, it may skip the traditional POST (Power-On Self-Test) phase, making it difficult to catch the key prompt. In this case, you can access the advanced startup options directly from Windows. Navigate to Settings, then Update & Security, and select Recovery. Under Advanced startup, click Restart Now. Once the system reboots into a blue menu, choose Troubleshoot, then Advanced options, and finally UEFI Firmware Settings. Click Restart to enter the BIOS/UEFI interface.

Navigating to Video Configuration Settings

Once inside the BIOS or UEFI, the layout will differ based on whether your motherboard uses a simple text-based interface or a modern graphical UEFI shell. Most modern motherboards use a graphical interface accessible via mouse. Use the arrow keys or mouse to navigate to the Advanced tab or Chipset configuration section. Look for a submenu labeled Onboard Devices Configuration, Integrated Peripherals, or North Bridge Settings. The exact naming convention depends heavily on whether you are using an ASUS, MSI, Gigabyte, or ASRock motherboard. Within these submenus, search for options related to Graphics Adapter or Primary Display. You may see choices like Auto, PCIe, or iGPU. Ensure that the iGPU or Integrated Graphics option is enabled. If the system is set to PCIe only, the integrated graphics will be disabled entirely, and changing the shared memory size will have no effect. Look for a setting named Share Memory, DVMT Pre-Allocated, UMA Frame Buffer Size, or Graphics Aperture Size. This is the specific parameter that controls how much system RAM is reserved for the integrated GPU.

Adjusting the Memory Allocation

Select the shared memory setting and change its value. Available options typically include 32MB, 64MB, 128MB, 256MB, 512MB, 1GB, 2GB, or Dynamic. The Dynamic option allows the system to allocate memory on demand up to half of your total available RAM, which is often the safest and most efficient choice for most users. If you manually set a fixed value, consider your total system RAM. It is generally recommended not to allocate more than 2GB or 4GB to integrated graphics unless you have a large amount of RAM (16GB or more). Allocating too much memory to the GPU reduces the amount available for your operating system and applications, which can lead to system-wide slowdowns. After selecting your desired value, save the changes. This is usually done by pressing F10 or navigating to the Exit tab and selecting Save & Exit Setup. Your computer will reboot with the new memory allocation active.

Verifying the Changes

Once Windows loads, you can verify that the change was successful. Open Task Manager by pressing Ctrl+Shift+Esc and navigate to the Performance tab. Select the GPU icon. At the bottom of the window, look for Dedicated GPU memory and Shared GPU memory. While Windows may still report a small dedicated amount if the driver supports it, the Shared GPU memory should reflect the new limit you set in the BIOS. Be aware that some drivers may cache the old value until a full shutdown and power cycle, not just a restart. If the change does not appear immediately, shut down the computer completely, wait ten seconds, and turn it back on. If you continue to experience high resource usage after adjusting memory, you might want to investigate other potential culprits. For instance, checking Limit CPU usable by specific program? can help you manage background processes that might be competing for system resources alongside your graphics operations.

Frequently Asked Questions

Can I change shared memory size in Windows Device Manager?

No, the Device Manager in Windows does not provide an interface to alter the hardware-level memory allocation for integrated graphics. This setting is strictly controlled by the motherboard firmware (BIOS/UEFI) during the boot process. Any attempt to find this option in Windows software will likely lead to third-party utilities that merely simulate the effect or fail to modify the actual hardware register.

What happens if I set the shared memory to maximum?

Setting the shared memory to the maximum available can starve your operating system and running applications of necessary RAM. This often results in system instability, frequent paging to disk, and overall sluggish performance. It is best to leave the setting on Dynamic or allocate a moderate fixed amount like 512MB or 1GB for typical desktop usage.

Does increasing shared memory improve gaming performance?

It can improve performance if the integrated GPU was previously bottlenecked by a lack of video buffer. However, if your GPU is already struggling with processing power, adding more memory will not significantly increase frame rates. For heavy gaming, a dedicated graphics card is always superior to relying on increased shared system memory.

How do I know if my motherboard supports changing this setting?

Most consumer motherboards support this feature, but some very basic or OEM-prebuilt systems may lock these settings for stability reasons. If you cannot find the Share Memory or DVMT Pre-Allocated option in the BIOS, your manufacturer may have disabled user modification. In such cases, updating the BIOS to the latest version might reveal hidden options or enable dynamic allocation automatically.

Is it safe to reset BIOS settings after changing memory?

Yes, it is safe. If you experience system instability or boot failures after changing the shared memory size, you can clear the CMOS or select Load Optimized Defaults in the BIOS. This will revert all settings, including the shared memory allocation, to the manufacturer's recommended factory values.