AMD Radeon HD 6990
Design and Features
There's no doubt about it: Everything about the 6990 is big, starting with its specs. It packs 5.1 teraflops of compute power. It has a core base clock speed of 830 MHz. It has 3,072 stream processors, 192 texture units, and 64 ROPs. It's got a frame buffer of 4GB of GDDR5 memory, operating on a 5-Gbps, 256-bit memory path.
Performance, Power Consumption, and Noise
Of course, the primary thing that anyone seriously considering the 6990 cares about (and should care about), is performance. And this card's, as we've said, is unparalleled. We hit it with our entire arsenal of DX11 benchmark tests—all at the highest typical resolutions (1,920 by 1,200 and 2,560 by 1,600), with the details maxed out—and the 6990 made mincemeat of them. It then proceeded to bake that mincemeat into pies and feed them to not just Nvidia's performance leader, the GTX 580 (we also tested Zotac's overclocked version), but also the 5970, earning across the board the best scores we've seen.