Gamers and PC enthusiasts alike are no strangers to GPU overclocking. And now AMD is trying to boost the profile of its flagship Radeon 4890 graphics card by offering a If AMD feels confident enough to boast about the HD 4890 exceeding 1GHz with nothing but air-cooling, perhaps they should back it up by also covering those who want to overclock it themselves and avoid paying a premium. Multiple AMD vendors, including Sapphire and XFX, are expected to release these “Black Edition” 4890s for a yet to be determined price.