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GDDR4 SGRAM (Graphics Double Data Rate type four Synchronous Graphics Random-Access Memory) is a type of graphics card memory specified by the JEDEC Semiconductor Memory Standard.〔(【引用サイトリンク】title=Standards & Documents Search: sgram )〕〔(【引用サイトリンク】title=Standards & Documents Search: gddr4 )〕 It is a rival medium to Rambus's XDR DRAM. GDDR4 is based on DDR3 SDRAM technology and was intended to replace the DDR2-based GDDR3, but it ended up being replaced by GDDR5 within a year. ==History== * On October 26, 2005, Samsung announced the development of 256-Mbit GDDR4 memory running at 2.5 Gbit/s. Samsung also revealed plans to sample and mass-produce GDDR4 SDRAM rated at 2.8 Gbit/s per pin.〔(Samsung Electronics Develops Industry's First Ultra-Fast GDDR4 Graphics DRAM ) 〕 * On February 14, 2006, Samsung announced the development of 32-bit 512-Mbit GDDR4 SDRAM capable of transferring 3.2 Gbit/s per pin, or 12.8 GB/s for the module.〔(Samsung Develops Ultra-fast Graphics Memory: A More Advanced GDDR4 at Higher Density )〕 * On July 5, 2006, Samsung announced the mass-production of 32-bit 512-Mbit GDDR4 SDRAM rated at 2.4 Gbit/s per pin, or 9.6 GB/s for the module. Although designed to match the performance of XDR DRAM on high-pin-count memory, it would not be able to match XDR performance on low-pin-count designs.〔(Samsung sends GDDR4 graphics memory into mass production )〕 * On February 9, 2007, Samsung announced mass-production of 32-bit 512-Mbit GDDR4 SDRAM, rated at 2.8 Gbit/s per pin, or 11.2 GB/s per module. This module will be available for the latest version of AMD cards.〔(Samsung releases fastest GDDR-4 SGRAM )〕 * On February 23, 2007, Samsung announced 32-bit 512-Mbit GDDR4 SDRAM rated at 4.0 Gbit/s per pin or 16 GB/s for the module and expects the memory to appear on commercially available graphics cards by the end of year 2007.〔(Samsung accelerates graphics memory to 2000 MHz )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GDDR4」の詳細全文を読む スポンサード リンク
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