The ATI Radeon HD 4870 X2 driver lets Windows communicate with this dual-GPU graphics card, enabling hardware-accelerated graphics, display configuration, and supported gaming features. Selecting the right ATI driver package matters because this is a legacy GPU: Windows 7 and Windows 8 have legacy driver options, while official Windows 10 and Windows 11 driver support is not available.

Key Features

• Hardware-accelerated graphics: Enables the card’s supported DirectX and OpenGL capabilities for compatible games and graphics applications, rather than relying on a basic display driver.
• Dual-GPU operation: Provides CrossFire functionality for the two onboard graphics processors in supported applications. Performance gains depend on the game, driver profile, and system configuration.
• Display controls: Offers settings for supported resolutions, refresh rates, color adjustments, and multiple monitors through compatible ATI Catalyst software.
• Application-specific adjustments: Includes graphics quality and performance controls, such as anti-aliasing and texture filtering, where supported by the driver package.

How to Install

1. Confirm your hardware and Windows version. Open Device Manager and check the entry under Display adapters. Verify that your card is the ATI Radeon HD 4870 X2, then check whether your Windows installation is 32-bit or 64-bit.

1. Choose a compatible legacy package. Read the driver’s supported-products list and operating-system requirements before downloading. For Windows 7 or Windows 8, use a package explicitly listing your configuration. Do not assume a legacy installer supports Windows 10 or Windows 11 simply because it launches.

1. Prepare for the update. Close games and other graphics-intensive programs, and create a restore point if System Protection is enabled. If you are replacing a different graphics card or resolving driver conflicts, uninstall its previous graphics software first.

1. Run the installer. Open the downloaded package with administrator permissions and follow the prompts. Install the display driver and any compatible Catalyst components you need. Brief screen flickering during installation is normal.

1. Restart and verify operation. Reboot Windows, check Device Manager for warnings, and confirm your display resolution. Test a familiar application before changing advanced graphics settings.

On Windows 10 or Windows 11, a basic or automatically supplied driver may provide display output without full acceleration or dual-GPU features. Avoid forcing an incompatible package; newer supported graphics hardware may be necessary for reliable operation.

Common Issues and Fixes

• Installer fails or exits on modern Windows: The HD 4870 X2 only has legacy Catalyst drivers. Use the correct legacy package for your OS, run it in Windows 7 compatibility mode if needed, and avoid current Adrenalin installers.
• Device not detected or only one GPU appears: Check both PCIe power connectors—6-pin and 8-pin—are firmly seated and the PSU is adequate. In Device Manager, a working HD 4870 X2 typically shows two adapters. Reseat the card and test another PCIe x16 slot.
• Driver conflicts or Code 43: Remove old and Windows Update-supplied drivers with DDU in Safe Mode, install the matching legacy Catalyst version, then block Windows from auto-replacing it.