IIRC, an M40 is a pair of GPUs on one card, it has not video outputs, and it sucks a lot of power even for a GPU. I'm looking at used M6000. cards that seem a

IIRC, an M40 is a pair of GPUs on one card, it has not video outputs, and it sucks a lot of power even for a GPU. I'm looking at used M6000. cards that seem a better compromise at a higher price point.