AMD HD 6990 Review + BenchMarks ~ Saad Reviews (Reviews + Benchmarks)

AMD is a well-known brand both for its CPUs and GPUs and its competition with Intel in CPU market and with Nvidia in GPU market and they always has close and tough competition with Nvidia and they made many excellent performing GPUs. Today we take a look at it 1st Dual GPU card which is AMD HD 6990.For many months now the Radeon HD 6990 has been a product of much discussion. Nobody really could confirm what GPUs would be used, how much graphics memory it would get and so on. Well, rest assured. AMD stuck two Cayman XT GPUs (R6970) onto the PCB and allows them to be clock at R6970 speeds as well, in fact you'll get options in clock-frequencies and TDP with the help of a small micro-switch seated on the card, which leads to 2 vBIOS, one with more acceptable TDPs and the other enabling a higher clock frequency mode. Now I've stated it, Cayman XT GPUs, that means the full shader processor count inside that GPU is available, that sums up towards 3072 shader processors.The Radeon HD 6990 follows in the pedigree of Radeon HD 4870 X2 and Radeon HD 5970. It’s a dual-GPU card with graphics processors running, by default, at slightly reduced clock speeds compared to the company’s fastest single-chip board. Its 4 GB of memory are divided between both ASICs. So, you’re essentially looking at two 2 GB configurations on a single PCB, running in CrossFire.Although it was previously referred to by the code name Antilles, Radeon HD 6990 centers on two of the Cayman-based GPUs found in Radeon HD 6970 and 6950 graphics cards. If you remember from Radeon HD 6970 And 6950 Review: Is Cayman A Gator Or A Crock?, Cayman employs a slightly modified architecture, designed to extract more performance per square millimeter of die space. There are situations where this VLIW4 architecture could underperform AMD's older VLIW5 design, but the company says those situations are rare.The Radeon HD 6990 comes armed with an astonishing 3072 shader processors, thus 48 SIMD based shader clusters, split up in a twofold engine per GPU. The domain and shader clock is locked in at 830 or 880 MHz. The card comes paired with 4 GB of memory clocked at (effective) 5000 MHz (2GB per GPU). The TDP of this product is 350W in default mode, and in unlocked mode the card can consume 415W with a hefty game. There's room left for overclocking in the unlocked design though, you may take the card up-to roughly 450W.The card of course is an up-to-date DX11 class product with a couple of new features. Features wise, the graphics cards will be very similar to the last generation products and is merely an advanced, updated model. However some features like one DVI and four DisplayPort 1.2 monitor connectors are present for a full Eyefinity experience up-to five cards with just one R6990.in-depth regarding the architecture and features of AMD’s Cayman GPU, two of which power the Radeon HD 6990. In our reviews of the Radeon HD 5970 and 4870 X2, we talk of AMD’s GPU design philosophy and how the company has been able to use dual GPUs on a single PCB. And in the Catalyst Sneak Peek and X1950 coverage, we discuss some drive details and native CrossFire implementation. But enough with history, let's look at AMD's new flagship.any card that can eat up more the 400 watts in performance mode, is going to struggle to dissipate the heat produced under load. While we understand the difficulties of producing a capable, quiet cooler, AMD will always be hampered by using a small, single fan configuration on its high-end reference cards. As expected, this opens the market up to AMD partners such as Sapphire, PowerColor and XFX who will assuredly release updated versions of the card, with dual fan configurations, improved airflow and reduced noise levels. The reference card has been configured to keep temperatures well under 90c at all times, but it can also get loud – especially in high performance mode. AMD Always tried to beat Nvidia and this time they done it. They work hard and they done it. AMD HD 6990 beats Nvidia GTX 590 easily.Lets stop theory here.
And see some BenchMarks Results.....