AMD support now offers version 16.7.3 Crimson reference drivers for Radeon graphics cards, addressing some issues and improving performance for Rise of the Tomb Raider. Here's word:

Radeon Software Crimson Edition 16.7.3 Highlights

• Performance Improvements:
  • Rise of the Tomb Raider™ performance increase up to 10% versus Radeon Software Crimson Edition 16.7.2 on Radeon™ RX 480 graphics(1)

Fixed Issues

• Overwatch™ may experience an application crash on some Radeon™ RX 480 configurations when using AMD Crossfire mode.
• Vulkan™ information in the Radeon Settings software information tab may display an incorrect version.
• Radeon WattMan may retain settings of an overclock after it has failed. If you have failed an overclock with a system hang or reboot.
• Hitman™ may experience graphical corruption when the game is set to use DirectX®12 API and using zoom with weapons.
• Total War™: Warhammer may experience minor graphical corruption in some map textures on AMD Radeon R9 380.
• Flickering may be observed in Rise of the Tomb Raider™ on some AMD Crossfire configurations using the DirectX®11 API.
• Changing settings in Dragon Age Inquisition™ with the Mantle API may result in an application crash or driver recovery.
• DiRT™ Rally may experience flickering terrain in some races when the advanced blending option is enabled in the games settings page.
• Display may exhibit a minor flicker on Radeon RX 480 when Freesync is enabled on a games launch or exit.
• Shadows may experience rendering issues in DOTA2™ when using the Vulkan™ API.
• Textures may experience holes or gaps in DOOM™ when using the OpenGL API and three display AMD Eyefinity configurations.
• Need for Speed™ may experience flickering on some light sources in AMD Crossfire mode.
• Performing a task switch with two cloned displays during full screen gaming may cause flickering on the extended display.