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AMD 580 chipset series : ウィキペディア英語版
AMD 580 chipset series

AMD 580 chipset series is a computer chipset series designed by the AMD Graphics Product Group, for the AMD processors. It was designed for usage with ATI's CrossFire Multi GPU Technology, with both PCI Express slots running at x16 lanes each.
==History==

The 580X chipset was originally named the "ATI Radeon Xpress 3200 chipset". The Radeon Xpress chipset was designed by ATI to enter the realm of the desktop arena, especially the AMD Socket 939 platform where ATI's rival, nVidia, had a clear market advantage. The Xpress 200 was launched with the CrossFire edition of the chipset considered as the high end of the chipset. However, rolling delays with the Crossfire Master Cards forced ATI to launch the Socket 939 platform while the Intel platform was scrapped due to time constraints. Reviews painted the Xpress 200 Crossfire as a board that could match nVidia's nForce 4 SLI. With the release of the nForce 4 16x SLI, ATI changed strategy and announced the RD580 chipset.
The RD580 was the same as the Xpress 200 chipset with the exception of the 40 PCI Express lanes within the northbridge. It was claimed by ATI that having 2 chipsets with 20 PCI Express lanes would slow down data transfers when the chipset is working in multi-GPU configurations. Having all of the PCI Express lanes within the Northbridge claimed to be more efficient and less bottlenecking as compared to the nForce 4 16x SLI. The RD580 was called the "Radeon Xpress 3200" and was released on March 1, 2006. Supposedly, the chipset is also configured for the new Socket AM2 and of such, many motherboard manufacturers have decided to skip the Socket 939 RD580 and began research and development (R&D) on the Socket AM2 version of RD580.
With the launch of the socket AM2, ATI also announced the release of their SB600 southbridge which was to be compatible with the RD580 northbridge. Originally, the SB450/SB460 was highly flawed in the USB design and lacking in cutting edge features as compared to nVidia's counterpart which resulted in low sales. The ULi 1575 Southbridge was the other preferred Southbridge until nVidia took over ULI. As a result, high expectations was placed on ATI to design a Southbridge that was on-par or greater than the ULI 1575. As reference boards for Socket AM2 trickled out, many sites commented that ATI had an even footing against nVidia with great improvement in the SB600 southbridge.
As of the completion of the acquisition of ATI, AMD has currently moved to rename all ATI chipsets for the AMD platform. The Xpress 3200 CrossFire chipsets for Socket AM2 processors have been renamed as the "AMD 580X Crossfire" chipset, for the socket 939 variant, since AMD has stopped producing socket 939 CPUs, the "Xpress 3200 CrossFire" chipset for socket 939 CPUs, has not been renamed.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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