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Nvidia Geforce 6 Series Manual

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    Page 1 471 The GeForce 6 Series GPU Architecture Emmett Kilgariff NVIDIA Corporation Randima Fernando NVIDIA Corporation Chapter 30 The previous chapter described how GPU architecture has changed as a result of compu- tational and communications trends in microprocessing. This chapter describes the archi- tecture of the GeForce 6 Series GPUs from NVIDIA, which owe their formidable computational power to their ability to take advantage of these trends. Most notably, we focus on the GeForce 6800 (NVIDIA’s...
    Page 2 472Chapter 30 The GeForce 6 Series GPU Architecture bandwidth, until finally the PCI Express standard was introduced in 2004, with a maxi- mum theoretical bandwidth of 4 GB/sec simultaneously available to and from the GPU. (Your mileage may vary; currently available motherboard chipsets fall somewhat below this limit—around 3.2 GB/sec or less.) It is important to note the vast differences between the GPU’s memory interface band- width and bandwidth in other parts of the system, as shown in Table 30-1....
    Page 3 473 Table 30-1 reiterates some of the points made in the preceding chapter: there is a vast amount of bandwidth available internally on the GPU. Algorithms that run on the GPU can therefore take advantage of this bandwidth to achieve dramatic performance improvements. 30.2 Overall System Architecture The next two subsections go into detail about the architecture of the GeForce 6 Series GPUs. Section 30.2.1 describes the architecture in terms of its graphics capabilities. Section 30.2.2 describes the...
    Page 4 474 First, commands, textures, and vertex data are received from the host CPU through shared buffers in system memory or local frame-buffer memory. A command stream is written by the CPU, which initializes and modifies state, sends rendering commands, and references the texture and vertex data. Commands are parsed, and a vertex fetch unit is used to read the vertices referenced by the rendering commands. The commands, vertices, and state changes flow downstream, where they are used by subsequent...
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