I run Windows 7
I recently upgraded my NVidia 970 to a 1070ti
Been using it for a month and very happy with the increased render times in Iray.
Having read the mother board manual, if installed in the second PCI-E slot
The 1070 will still run at x16, but the 970 will be limited to x4.
I have an 850 watt PSU so it should ok but it will require moving some of the internal cabling and possibly removing a Hard drive cage.
Is any help in render times going to be worth it?
My thinking also is that with the scene having to be sent to both cards one of which is slower and limited to a PCI speed of x4 could it even have a negative effect on performance?