AMD release their driver for Windows 10 Preview.
http://support.amd.com/en-us/download/desktop?os=Windows+10+-+64
Up to date Graphic drivers can always be found in the Update section of the forum:
https://windowsforum.com/threads/graphic-drivers.11365/page-27#post-643920
Ref and download:For Windows 10 (64-bit)
The AMD Catalyst™ Software Suite, AMD Catalyst™ 15.7 contains the following: AMD Catalyst™ Display Driver version 15.20.1046
Compatible Operating Systems: Windows® 10 (32 & 64-bit), Windows® 8.1 (32 & 64-bit) and Windows® 7 SP1 or higher (32 & 64-bit)
This is a Technical Preview driver with full WDDM 2.0 support for Windows® 10 and DirectX® 12 on all Graphics Core Next (GCN) supported products, -AMD Radeon™ HD 7000 and newer graphics products. Official driver support for AMD products will be available when Microsoft launches Windows® 10 on July 29th, 2015.
Included Highlights: Visit the Features section below to learn more about the following:
- Windows® 10 Technical Preview Support
- Virtual Super Resolution (VSR)
- Frame Rate Target Control™ (FRTC)
- Performance Optimizations versus AMD Catalyst™ Omega
- AMD FreeSync™ and AMD CrossFire™ Support
http://support.amd.com/en-us/download/desktop?os=Windows+10+-+64
Up to date Graphic drivers can always be found in the Update section of the forum:
https://windowsforum.com/threads/graphic-drivers.11365/page-27#post-643920