First, you would want to run Memtest86. Create bootable USB media, boot to the created USB drive and run four passes of all eleven tests.
If that passes, then download and install Prime95 version 26.6, and ONLY version 26.6. Click on Custom. Enter 512k in the min FFT field. Leave the max FFT field at 4096k. Enter 8192 in the amount of memory to test field. Run for 8 hours.
You will want to have HWinfo (Sensors only) running alongside Prime95 so you can occasionally monitor all threads to make sure all cores and thread remain at 100%. If any core drops out, then that worker had errors and there are stability issues that require reconfiguration of the memory. That might be a change of timings or an increase in voltage. Also, in HWinfo you will want to monitor the memory for the first half hour or so to make sure that the DIMM temperature of both modules remains below 60°C. Most memory is ok up to 80°C but if it's running higher, ever, than 60°C then something is probably either not configured right, the voltage is way too high or there is a serious lack of case airflow.