For single GPU setups, you could use an external GPU setup such as http://www.razerzone.com/store/razer-core http://www.razerzone.com/store/razer-core instead o

For single GPU setups, you could use an external GPU setup such as http://www.razerzone.com/store/razer-core http://www.razerzone.com/store/razer-core instead of using a large PC meant for high-end GPUs. Or you could use a dedicated ultra small form factor machine such as https://www.youtube.com/watch?v=s2W0Lsf7hec https://www.youtube.com/watch?v=s2W0Lsf7hec for ~$500 + GPU if you want a dedicated GPU box. But for the people for whom it makes sense to buy hardware for deep learning instead of using a cloud service, a $4k 4x GTX machine would be better.