Have installed driver 378.92 and it did work out. Booth cards binded.
Now I have fair 111.32 points in OctaneBench. Not much but at least it goes.
Thanks everyone.

Have tried another riser.
The same "Cuda error 2 out of memory"

bepeg4d wrote: I’m try to guessing, based on my forum experience.

Did it happen before?

Alright, I'll try to connect another riser.

bepeg4d wrote:Hi,
Note that the quality of the riser is very important, and to correctly power up the bus.

Do you suppose that the riser could spoil the binding?

bepeg4d wrote: The things could be completely different if you add another 1060 6GB, instead of GTX 750ti.

Yes, but if cannot yet bind both devices what the difference will be? Still will be working single GPU. As it is now.
First have to figure out what is happening.

Hi,
PCIx1 2.0 is too slow
Not exactly.
I tested 750 ti on PCIx16 3.0 - the result is 32
On PCIx1 2.0 it is 31.03
https://render.otoy.com/forum/download/file.php?mode=view&id=68150&sid=1f42c3ab521f11032126071b8ac786af

try to untick the Use for Tonemapping option in Preferences/Devices for the ...

Hello.
I've got two GPUs:
1. GTX 1060 6 Gb - plugged in PCIx16 3.0
2. GTX 750 Ti 2 Gb - connected via riser into PCIx1 2.0.
https://2miners.pro/upload/iblock/67d/67d23daae917ed021cd6cf6fa56ffe76.jpg

OctaneBench sees both cards but runs test only on single one.
When I select booth cards the app ...