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We describe the GRAPE-DR (Greatly Reduced Array of Processor Elements with Data Reduction) system, which will consist of 4096 processor chips each with 512 cores operating at the clock frequency of 500 MHz. The peak speed of a processor chip is 512Gflops (single precision) or 256 Gflops (double precision). The GRAPE-DR chip works as an attached processor to standard PCs. Currently, a PCI-X board with single GRAPE-DR chip is in operation. We are developing a 4chip board with PCI-Expressdoi:10.1145/1362622.1362647 dblp:conf/sc/MakinoHI07 fatcat:5w5ogh4po5bdxp4uzi4aif3ese