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In 2000, Rambus began filing lawsuits against the largest memory manufacturers, claiming that they owned SDRAM and DDR technology.Seven manufacturers, including Samsung, quickly settled with Rambus and agreed to pay royalties on SDRAM and DDR memory. Thus, the case returned to Virginia per the CAFC ruling.
According to the Wall Street Journal, history of Rambus has been "marked by litigation, including patent battles with numerous chip makers".This was significantly faster than the previous standard, PC133 SDRAM, which operated at 133 MHz and delivered 1066 MB/s of bandwidth over a 64-bit bus using a 168-pin DIMM form factor.Some disadvantages of RDRAM technology, however, included significantly increased latency, power dissipation as heat, manufacturing complexity, and cost.PC800 RDRAM operated with a minimum latency of 45 ns, compared to 15 ns for PC133 SDRAM.RDRAMs can also be told to increase their latencies in order to prevent the possibility of two or more chips transmitting at the same time and causing a collision.Rambus, a California company, was incorporated in 1990 and re-incorporated in the state of Delaware in 1997.
The company was listed on NASDAQ in 1997 under the code RMBS.
In June 2005, Rambus also sued one of its strongest proponents, Samsung, the world's largest memory manufacturer, and terminated Samsung's license.
Samsung had promoted Rambus's RDRAM and currently remains a licensee of Rambus's XDR memory.
In May 2001, Rambus was found guilty of fraud for having claimed that it owned SDRAM and DDR technology, and all infringement claims against memory manufacturers were dismissed. In January 2005, Rambus filed four more lawsuits against memory chip makers Hynix Semiconductor, Nanya Technology, Inotera Memories and Infineon Technology claiming that DDR 2, GDDR 2 and GDDR 3 chips contain Rambus technology.
In January 2003, the CAFC overturned the fraud verdict of the jury trial in Virginia under Judge Payne, issued a new claims construction, and remanded the case back to Virginia for re-trial on infringement. In March 2005, Rambus had its claim for patent infringements against Infineon dismissed.
In the early 1990s, Rambus was invited to join the JEDEC.