The interesting result was able to be obtained when some versions were tested.
System
Windows7
Radeon HD 7970
Test Driver List
13.9 WHQL
13.12 WHQL
14.4 WHQL
14.7 beta
In the capture of OpenGL (Minecraft), 13.X did not have a performance problem.
However, in 14.X, performance falls extremely.
Probably the driver code of data transfer will not be optimized.
Since it was the same as the time of Mantle release, specification was changed, possibly the reference module was used temporarily.
NVIDIA is also, but that the implementation of OpenGL is shoddy, there are occasionally.
There is no such problem in GeForce currently.
Update
ver2.0.129 later, this problem has been resolved.