Given almost-embarrassing fan steppings, multiple attempts at functioning CrossFire profiles, driver anomalies, and a general reluctance to talk about the logistics of actually selling the Radeon HD 6990, I get the sense that AMD rushed this launch. Marketing 101: it’s better to claim first-place today and possibly get passed up tomorrow than have to launch a second-place card tomorrow.
So, we end up with a flagship board that is undeniably fast. It’d really be an all-out rock star if performance were our only consideration.
As it sits, though, heat and noise are this card’s enemies in the same way they plagued Nvidia’s GeForce GTX 480.
Those detractors might even be forgivable if there weren’t better options available. Let’s just assume two of these in quad-CrossFire isn’t even an option for most people, and you’re looking at the best possible way to leverage two GPUs.
A pair of Radeon HD 6970s sacrifices nothing except space in your case. That combo is faster, quieter, and more effective at dealing with heat. A pair of GeForce GTX 570s would be a great alternative, too. You give up a bit of speed in some situations, but they’re even quieter than the 6970s.
Skip the Radeon HD 6990 altogether and take advantage of fantastic CrossFire and SLI scaling using more elegant single-GPU cards.