Today, AMD launched its Radeon HD 6990 graphics card, its fastest graphics card, in contention for being labeled the fastest graphics card money can buy. What happens when you pair two of these? You get Radeon HD 6990 CrossFireX, a 1398 Dollar solution that combines four AMD Cayman GPUs, a total of 8 GB of memory, 6144 stream processors, and enough display outputs to make a military-class vehicle simulator using clever use of Eyefinity and HydraVision technologies. Or, you can just bulldoze through DirectX 11 games using HD 6990 CrossFire with a lot of eye-candy turned on, and at par-HD (2560x1600 or 2560x1440) resolutions. This is also going to be the solution overclockers will have an eye out for. Before you proceed, make sure you’ve been through our ASUS Radeon HD 6990 review, where you’ll get to see what the single graphics card is worth.
We are running PowerColor Radeon HD 6990 graphics cards, which stick to AMD’s reference board design. Installing CrossFire is as easy as installing the second card, connecting the power cables, the CrossFire cable to the other card, and enabling HD 6990 CrossFireX in Catalyst Control Center.
|Radeon HD 6990||Radeon HD 6990|
|Shader units||480||1536||512||2x 1600||2x 1536||4x 1536|
|ROPs||48||32||48||2x 32||2x 32||4x 32|
|GPU||GF100||Cayman||GF110||2x Cypress||2x Cayman||4x Cayman|
|Transistors||3200M||2640M||3000M||2x 2154M||2x 2640M||4x 2640M|
|Memory Size||1536 MB||2048 MB||1536 MB||2x 1024 MB||2x 2048 MB||4x 2048 MB|
|Memory Bus Width||384 bit||256 bit||384 bit||2x 256 bit||2x 256 bit||4x 256 bit|
|Core Clock||700 MHz||880 MHz||772 MHz||725 MHz||830 MHz||830 MHz|
|Memory Clock||924 MHz||1375 MHz||1002 MHz||1000 MHz||1250 MHz||1250 MHz|