So I have a GTX 970 and updated 2 days ago to the pre-release of the new agisoft software..
AND IT IS WONDERFUL!!! :-)
It fully supports the new nvidia drivers and wow, it is seriously faster then my i7 :-) I can now do a dense cloud in high render in 10 minutes, while this normally took over an hour :-)
Agisoft PhotoScan Version: 1.1.0 build 1995 (64 bit)
OpenGL Vendor: NVIDIA Corporation
OpenGL Renderer: GeForce GTX 970/PCIe/SSE2
OpenGL Version: 4.4.0 NVIDIA 344.75
With 6 out of 8 CPU cores enabled:
Device 1 performance: 45.1756 million samples/sec (CPU)
Device 2 performance: 574.931 million samples/sec (GeForce GTX 970)
With 0 out of 8 CPU cores enabled: (so only GPU):
Device 1 performance: 609.602 million samples/sec (GeForce GTX 970)