According to the release notes, the new Radeon Software Crimson ReLive Edition 17.6.1 beta driver include optimizations for DiRT 4 game including both multi-GPU profile as well as up to 30 percent performance improvement on Radeon RX 580 8GB graphics card with 8xMSAA setting. The new driver also brings up to 4 percent performance improvement in Prey game with the same graphics card.
The new Radeon Software Crimson ReLive Edition 17.6.1 driver fixes several issues, including problems with HDR on some QHD and higher resolution monitors, fixes Virtual Super Resolution issues on some Radeon RX 400 and RX 500 series graphics cards, fixes flickering issues on RX 500 series with HDMI and QHD resolution monitors, fixes issues with AMD XConnect, issues seen with fast mouse movement which may cause an FPS drop or stutter in Prey game with multi-GPU systems, issue with memory clocks on Radeon R9 390 series and when FreeSync is used, issues with Mass Effect: Andromeda on some multi-GPU configurations, GPU Scaling issues on multi-GPU configurations and more.
As always, the Radeon Software Crimson ReLive 17.6.1 driver supports all Radeon series graphics cards since HD 7700/HD 7900 days and is available for Windows 10 and Windows 7 in both 32-bit and 64-bit versions as well as Windows 8.1 in 64-bit version.
You can check out full release notes and download the latest Radeon Software Crimson ReLive 17.6.1 driver over at AMD's support page.