Titan Black vs 2x970 rendering far too slow Was wondering why my renderings at work were so slow, so I decided to compare the same file with my machine at home and was struck by the difference. ie at work I have a TitanBlack and it took 4 minutes to render 


( http://i.imgur.com/oMbMtgf.jpg )

, while at home it took 40 seconds 


( http://i.imgur.com/MPqobMB.jpg ).

I know there should be a difference of about double the time going off these benchmarks http://blenchmark.com/gpu-benchmarks but 40 seconds compared to 4 minutes is a big leap especially when rendering for animations.

Any reason why this is happening? The specs for both machines are below (sorry I'm not much of a hardware man)...

Work (Win7): Titan Black
http://i.imgur.com/DMlmNCg.jpg

Home (Win10): 970x2
http://i.imgur.com/LEHp3Vq.jpg
There was a recent rendering issue with the 9xx series cards on Win10. You can find out more on the bug report page.

https://developer.blender.org/T45093

You should be able to get better performance with updated nvidia drivers for windows, and the most recent builds of blender.