Krnlx,
Under CUDA8.0 difficult to adapt?
You can build it with 7.5, 8.0 or 9.0 without any problem. Code is friendly to CUDA version bump. 9.0 is significantly faster than 8.0, didn't measure against 7.5.
can i build it against cuda9 and copy the binary to rigs with only cuda8 installed? does it run slower than cuda9 rig?
upgrading all my rigs from cuda8 to cuda9 isn't a trivial work, a rig is dead during the upgrade, it cannot boot.