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I would suggest that you run CPU-z, go to the SPD tab and then get RAM with the same frequency, voltage and CAS latency.
If you don't know how to interpret it, please post a screenshot here.
If your RAM is running at 1333MHz, then the Frequency would be 667 MHz in CPU-z, because DDR stands for Double Data Rate, and 667MHz * 2 ~= 1333MHz.
The timings, frequency & voltage that should be used would be shown in the right-most column of the Timings table.