I have the slight older 7970 ghz though same chipsets so should be close at md5 hash Speed.GPU.#1...: 7114.7M/s
With updated software and on the 290x card you can see the results here. https://gist.github.com/epixoip/8171031 that gives you a md5 hash Speed.GPU.#1.: 10200.8 MH/s
Comepare that to a gtx 970 speeds found here https://gist.github.com/joshuaskorich/7678d4fcbf49acb69387 of md5 hash Speed.GPU.#1.: 9524.5 MH/s
At time of this writing the price difference between the 290x ND the 970 is a huge $70
~340 for the 970 EVGA GeForce GTX 970 Super Clocked ACX 2.0 4GB GDDR5 Graphics Card https://www.amazon.com/dp/B00NVODXR4/?tag=httplocaltech-20
And ~270 for 290x XFX Double D R9 290 947MHz 4GB DDR5 DP HDMI 2XDVI Graphics Cards R9290AEDFD https://www.amazon.com/dp/B00HHIPM5Q/?tag=httplocaltech-20
So with the newer 290x AMD came a long way in improving the card over all performance.