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I have two GTX 1080 and for a while when i press F12 blender rendered everything with 2 tiles. Right now no matter what i do there is only one render tile. In system tab in user preferences i can ether select both GPUs or none, does anyone know a solution to this. BTW it is not hardware

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Someone answered me elsewere.

Turns out you need to have your SLI "DISABLED" which is very confusing since you need to enable that to have better performance in everything else.

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