Hi just installed my new AMD 6970 with no problems from motheboard used the 10.12 hotfix drivers, it runs a lot cooler to than the 4870x2 these are some readings i have taken and this is my system now.
NZXT Lexa S
Gigabyte 890GPA-UD3H (rev 2.0) motherboard
AMD Phenom II X4 965 Black Edition, Deneb Core, S AM3, 3.4GHz
8gb Crucial Ballistic DDR3 1333mhz/PC3-10600 (7-7-7-24) 1.65v
XFX HD 6970 ATI - AMD Radeon Graphics Card - 2GB
Western Digital WD6402AAEX 640GB Hard Drive SATA111 7200rpm 64MB Cache-OEM Caviar Black.
Seagate Baracuda 500gb SATA11, 32mb Cache
Corsair 750 PSU
Zalman 9500
Liteon DVD Writer
24” Samsung SM2433BW Black Widescreen LCD, 1920x1200
5.1 Creative Surround Speakers
Logitech G11 Gaming Keyboard
Logitech MX516 Gaming Mouse
Windows 7 Home Premium 64bit
Epson DX8400 All in one.