Stefan Mileschin

As the R9 285 OC model from Gigabyte, the HIS R9 285 IceQ X2 2GB OC video card is based on the Tonga architecture and is using a new form of compression for frame buffer color data, which reduces the amount of memory bandwidth required for buffer operations. The product is overclocked from the factory but not as high as the Gigabyte R9 285 OC so the overall results were a bit lower in the synthetic benchmarks but also inside the games. However, we could overclock the card quite a bit with the supplied utility and have reached similar performance when the card was maxed-out.

http://www.madshrimps.be/articles/article/1000674/