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This paper introduces Eldorado, a third generation multithreaded architecture. Previous Cray multithreaded systems were plagued by unreliable hardware and high costs. Eldorado corrects these problems by using many parts built for other commercial systems. Its compute processor is a 500 MHZ multithreaded processor architecturally similar to the MTA-2 processor; but its interconnection network, I/O subsystem, and service processors are borrowed from other Cray systems. Eldorado retains the programming model, operating system, and tools of the MTA-2. It has the same capability as the MTA-2 to tolerate latencies and achieve high performance on programs that run poorly on SMP clusters. We present several programming examples to illustrate performance and scalability in the presence of high memory and synchronization latencies