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Please make sure that you have the latest bios for your MB and then load optimized defaults and set the Dim Voltage to 1.6 volts and then set the timings to 9-9-9-24 (CAS-tRCD-tRP-tRAS) and then test the modules one at a time with www.memtest.org in the same slot. Please allow memtest to run 2-3 passes on each module and let us know the results.
Please note that it is very unlikely that both modules go bad at the same time. If you get errors with both of them then that would usually suggest other problem. Thank you.