![]() Dual-GPU graphics cards from the RADEON HD 4800 family So, let's examine detailed characteristics of dual-GPU RADEON HD 4800 graphics cards, based on the RV770 GPU. AMD/ATI DirectX 10 Series: RADEON HD 2900 XT (R600). ![]() The detailed information about AMD RV7xx and R6xx unified architectures is provided in these articles: These articles predicted the current situation with GPU architectures, and confirmed many of our assumptions about future solutions. DX.Next: The Nearest Future of Hardware Graphics Acceleration.DX.Update - 3D Graphics Accelerators: Half a Step Forward.Longhorn - Graphics Cards and Shaders for DirectX 10.Twice as powerful.īefore you read this article, you may want study these baseline theoretical articles, which describe various features of graphics cards and architectural peculiarities of older products from NVIDIA and AMD. Even though it's just an improved version of the R6xx architecture, it features a lot of changes, justified hundred-per-cent - all drawbacks of previous GPUs have been actually removed, so we've got a really powerful solution. If you don't know about the AMD RV770 architecture, you can read all details in our baseline review. Basically, performance differences have to do with different video memory volumes. There is a little difference from a system based on two HD 4870 cards solely because of some architectural changes to be described below. This dual-GPU system is based on CrossFire, implemented on the hardware level, PCI Express lanes and the bridge are installed right on the board. The theoretical part about the dual-GPU card based on the known architecture cannot be long, it's just two RV770 GPUs installed on a single PCB with memory, bridge, and other elements. As a result, multi-GPU systems often demonstrate high FPS accompanied by control lags and lack of smoothness. Without touching upon main problems of multi-GPU rendering in AFR mode - draw latencies, typical of such configurations. We repeat, even though it's convenient to design products for various price segments using varying number of the same GPUs, single-GPU solutions of similar complexity will always have a certain advantage: they will be faster in all applications, not only in those optimized for multi-GPU configurations, they won't contain excessive units in each GPU, and they will offer better power consumption and heat release. We can accept 2.4 teraflops of theoretical performance with some reserve, but, for example, doubling memory capacity is quite disputable. AMD just multiplies all technical characteristics by two. RADEON HD 4870 X2 based on two RV770 GPUs, connected with a special bridge, uses CrossFire technology and Alternate Frame Rendering (AFR). ![]() Now it's time for a sterling article with theoretical data, synthetic tests, and an expanded set of games. We've already published its preview with several tests. Then the company presented a dual-GPU solution on a single PCB, the RADEON HD 4870 X2. The company itself mentioned on many occasions that it was going to manufacture single-GPU graphics cards for Mid-End and Lower High-End segments, and offer dual-GPU solutions for the top segment.įirst of all, it was planned to oppose GeForce GTX 280 with CrossFire configurations based on two separate HD 4850 or HD 4870 cards. We're talking about RADEON HD 4870, the fastest single-GPU solution of the HD 4800 series. In fact, AMD has a single-GPU competitor only to oppose NVIDIA GeForce GTX 260, the cheapest card in the series. We've repeatedly stated that AMD would offer high-end CrossFire multi-GPU solutions. ![]()
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