1.0.8, + 4x 970 CPU loaded on 80%, and a miner does not work, very slowly.
1-2-3x 970 works fine.
cpu amd 2 cores, nvidia driver last.

what is missing?
how much RAM you got there and which OS? btw i'm probably not the most experienced here with just 1 970. there are others here who've got big nvidia rigs