I have 2xHD 7990 it worked fine under Windows 7.
Then i made the Upgrade to Windows 10 and now i get this
“CL_MEM_OBJECT_ALLOCATION_FAILURE” Error when i set the Tile-Size larger then 128.
Thats a Problem, because as you can see in my video below, Cycles will speed up a lot if you use
a larger tile-size in OpenCL.
Also the Open_CL Memory is never returned. Means - after this error i have to restart Blender to render anything using OpenCL. I have actually to stick with a Tiles-Size of 128 or even go down to 64. Which is not more faster then MY CPU i guess …
ATI-Driver: I have “Radeon 16.1” Windows 10.
From my actual experience i can only say “DO not upgrade to Windows 10”.
I have shown this Problem at the End of my Video.