In July 2008, Rambus Inc. filed a lawsuit against Nvidia Corporation, claiming the graphics chip maker infringed 17 of its patents. Since the initial complaint, Rambus Inc. dropped 12 patents from its suit and a recent judgment reduced the number of patents infringed to 3. Of these, U.S. Patent No. 6,591,353 and No. 6,470,405 relate to DRAM controllers and the configuration of data transfer.