A test on the eVGA GeForce GTX 280 HC16 Hydro Copper. A water-cooled pre-overclocked heavily pimped out EVGA GTX 280 HC 16 is what we'll review today. EVGA already overclocked this monster for you. The core is overclocked by another 89MHz (602MHz to 691MHz), memory by 108MHz (reference 1107MHz to 1215MHz) and the shaders are up from 1296MHz to 1458MHz.