Our GTX 970 SLI (Phantom + SC ACX 2.0) setup proved very efficient. Despite the fact that both cads are factory overclocked, the max system consumption hit just 500W, a full 100W less than the GTX 780 Ti SLI.

This is a good result and it is good news for enthusiasts on a budget, as it is possible to run one or two fast cards even on relatively weak PSUs, so few people will have to upgrade their power supplies if they choose to go SLI.