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No because the Dell optiplex 390 has ddr3 dimm slots not ddr4 which is this ram stick
Sorry, there was a problem. Please try again later.Hi JC, It is not, you'd need a very low capacity DDR3L kit @1600MHz, either 2gb or 2x4gb. If you have any other questions, please reach out: support.corsair.com
Sorry, there was a problem. Please try again later.No, it is not compatible with a Dell OptiPlex 390.
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