Hexus posted a review on the EVGA GeForce GTX 970 Super Superclocked
A quote from the article:
Better than the rival R9 290X? December 2014 saw EVGA release the GeForce GTX 970 Super Superclocked (SSC) ACX 2.0 (04G-P4-2975-KR) graphics card in very limited numbers through a handful of etailers in North America, Germany, and the Nordics.EVGA GeForce GTX 970 Super Superclocked Review @ Hexus
Priced at $359.99, or $30 more than reference, the original SSC version's 1,190MHz core and 1,342MHz average boost speeds provided a significant in-game performance uplift over the bog-standard card.
EVGA has since updated the still-capable GeForce GTX 970 GPU by releasing a newer, cheaper SSC ACX 2.0 model that's widely available now.