AMD has hoped to corner the more widely accessible range of high-end video cards Tuesday by unveiling the Radeon HD 7950. It trims back slightly from the range-leading 7970 with 1,792 visual processing cores instead of 2,048, 112 texture units instead of 128, and both 800MHz core and 1.25GHz memory clock speeds versus the 925MHz and 1.38GHz of its counterpart. The chipset is still powerful enough to handle 4K video and carries the 384-bit memory bus and 3GB of video RAM.