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Continue to Chat(USED) DELL OptiPlex 990 CORES NA 3.80Ghz 4G 500G OptiPlex-990-NA SFF Small Form Factor https://www.c2-computer.com/zh-cn/products/used-dell-optiplex-990-cores-na-3-80ghz-4g-500g-optiplex-990-na-sff-small-form-factor