sli

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sli
SLI stands for Scalable Link Interface (scalable connection interface), it is through a special interface connection, in a dual PCI Express X 16 of the motherboard, while the same model using two PCIE graphics card . NVIDIA on the workstation in order to enhance the competitiveness of the product, after all, with ATi FireGL series nVIDIA encroaching in the area of the market. Product line in the future, SLI will become the new highest point.
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Sli origin of the actual performance of the operating principle of the development of international freight terms Hybrid SLI multi-graphics parallel mechanism of the origin of the history dates back to 1997, when the graphics card market was a dominant 3Dfx , the company launched in the second half of 1996 as fans crazy Voodoo accelerator card generation pursuit of classic products. In early 1998, 3Dfx released their second-generation 3D graphics card products-Voodoo 2, Voodoo 2 was the pixel fill rate has 90Mps, with Z-Buffering, Anti-Aliasing, single-cycle dual-texture was the most advanced 3D features, significantly beyond its predecessor, the other opponents are far behind in the rejection. However, most fans is Voodoo 2 mad possess Thus, it is far behind other competitors. We know the running Sli, CPU parallel operation is obtained through the instructions executed in parallel, but differ on the card for the situation. The resulting graphics is the rendering of 3D images, this work contains a large number of instructions, and how the equal distribution of work to be a problem, 3Dfx selected picture frame line by way of rendering. SLI technology will be a rendering of the picture frame is divided into a section of scan lines (Scanline), if the Voodoo 2 graphics card with dual-operation mode, then the screen by a graphics card is responsible for rendering some of the odd frame lines, the other card renders even frames line Then the frame will also render complete line written to the frame buffer after the merger, the next display to display a full screen rendering. Not difficult to see, SLI technology allows rendering work is shared equally, each card needs to be done only 1 / 2 workload. In theory, rendering efficiency can be increased by 1 times naturally, this is the dual graphics cards in parallel significantly improve the performance of the secret. SLI is technically very successful, and enthusiasts of the Voodoo 2 can also have a great passion. At the time, if you want 1024 × 768 in the Principle after the Voodoo 2 Voodoo 3,3 Dfx not follow the SLI dual-graphics technology, but in the Voodoo 4/5/6 times, 3Dfx restored SLI, but there has been differences in the form of application. Voodoo 2 graphics cards in parallel operation of two-initiated, two graphics cards plugged into PCI slot and then connect a dedicated cable, it is not necessary, a single Voodoo 2 graphics card can also work alone, just slow it. The spring of 2000, 3Dfx graphics chips launched VSA100 was 3Dfx nVIDIA has been a leader in pressure, in order to regain its leading position, 3Dfx SLI technology to Reloaded. VSA100 can support single-chip, dual-chip and parallel operation of four-chip, single-chip version is the Voodoo 4, two-chip graphics card for the Voodoo 5 5500, while the four-chip graphics card is the famous Voodoo 5 6000. At this point, SLI technology evolved into multi-GPU single graphics card in the form of, without occupies two slots, but the internal working mechanism of the changes did not happen much, is still the way through the frame by rendering their implementation, and then in the frame buffer in a unified synthesis. For reasons known to all, these cards have not been widely recognized, 3Dfx from decline to death. In early 2001, nVIDIA acquisition of 3Dfx, SLI technology also will become history, although nVIDIA 3Dfx mastered all the technical, but it does not will it flourish, but continue to follow their own path, the purpose of the acquisition of 3Dfx may be only elimination of a competitor only.
picture shows the formation of two SLI graphics platform nNIDIA
After that, we see a smooth monopolized nVIDIA, ATi is gradually followed by challenge, GeForce and Radeon is the most frequently mention of the term As for SLI 3Dfx and its people has gradually been forgotten, even if occasionally some people talk about, and very often is that it was a bad strategy for realistic business and an expensive technology. In the history of graphics cards, in addition to outside the Voodoo 2 No more than one graphics card, multi-chip technology was successful, though tried ATi, XGI is also very best in the nascent field, however, proved to users of the program is not subject to welcome. However, no one thought to re-pick up the 3Dfx nVIDIA's SLI. June 29, 2004, nVIDIA released a grand scale Follow the However, if our in-depth analysis, we will find it with 3Dfx's SLI technology is not much the same place, basically a new nVIDIA graphics programs do more than out. nVIDIA's SLI technology and 3dfx's SLI though earlier the same abbreviation is already is a new technology, not only of different works, even the name is different, 3dfx's SLI (Scan Line Interleave, dual-line interlaced scan technology) is to screen sub- To scan a section of the frame line (Scanline), two graphics cards and even on the odd frame lines were rendered frame lines, and will also render the merger is completed after the frame line is written to the frame buffer, then the display can show a increase the complete picture. The nVIDIA's SLI, there are two rendering modes: split frame rendering mode (Scissor Frame Rendering, SFR) and alternate frame rendering mode (Alternate Frame Rendering, AFR), split frame rendering mode is the top and bottom of each frame is divided into two parts , on the part of the screen to complete the main graphics rendering, vice graphics card is rendering the screen to complete the lower half, and then Vice card will render the completed picture transmitted to the main card, master card and then render it with their own synthesis of the upper part of the screen as a complete picture; and alternate frame rendering mode is responsible for rendering an odd frame graphics, while the other is responsible for rendering even a graphics frame, alternating between the two rendered, in this mode, the two graphics cards are actually rendered complete picture, this time does not need to connect the monitor screen synthesis of the main graphics card work. In SLI mode, especially in the split frame rendering mode, the two graphics cards are not equal, in the operation work, a graphics card-based card (Master), the other one as a secondary card (Slave), of which the main Card is responsible for task assignment, rendering, compositing, output and control operations,paul smith bags, and vice card only receive tasks from the main card-related processing, and then pass the results back to the synthesis of the main card and then output to the monitor. In addition to the main graphics rendering to complete their tasks, but also the additional Vice-cards are responsible for the synthesis of the work of the signal returned, so the workload is much greater than the Vice-graphics. In addition, in SLI mode, you can only connect a monitor, and can not support long display. SLI technology is the development of continuous development, initially on the hardware platform has many restrictions, such as the need to use exactly the same card (same model with a graphics card manufacturer, and even graphics BIOS must be the same), but also between the two graphics cards must use the SLI bridge, SLI-the only Geforce 6800 Ultra/6800 GT and 6600GT graphics chips three and so on. Now you can use the SLI set up different manufacturers use the same graphics chip graphics card, low-speed SLI graphics cards do not have to use the bridge (though performance than when using the SLI bridge decreased), to support SLI graphics chip is also extended to the except Geforce 6200/6200TC all but the Geforce 6 series and all the Geforce 7 series, etc. However, each board of the two PCI-E slot spacing is not fixed, so different motherboard SLI bridge replacement is generally not The. The actual performance of SLI graphics technology can theoretically double the capacity, in practice, only a few tests, the performance in the actual game graphics can only be increased by 30% -70%, and in some cases even there is no performance increase, and the current can be a good game is not too much to support SLI. Of course, as the driver of the improvement of the existing issues should be solved gradually. Motherboard chipset on the two graphics cards based on their actual provision of PCI Express Lanes, a way to support SLI are not the same, there is added with PCI Express X16 PCI Express X4, and also has dual PCI Express X8's, nVIDIA nForce Pro 2200 his + nForce Pro 2050 and the nForce4 SLI X16, and nForce4 SLI X16 IE is to achieve a true dual PCI Express X16 in SLI. Hybrid SLI provides the latest in a hybrid SLI MCP78 features, namely, discrete graphics and integrated graphics SLI. There are two SLI mode. Performance mode power mode and power mode: when the integrated graphics motherboard and high-end NVIDIA SLI composition, in the 2D mode, using integrated graphics, 3D mode in the graphics card. This can play a power-saving effect. Performance mode: When the integration of NVIDIA graphics cards, such as motherboards and low-grade form Geforce8400 or Geforce8450 SLI, you can be involved in rendering two cards to improve graphics performance significantly. Terms of international freight shippers letter of instruction SLI is a short form, which means the international cargo shipping instructions. Atlas Atlas entry for more extended reading: 1
Yingwei Moda (NVIDIA Mount Machine Community): http://www.nvmod.com
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