Which frequency RAM should I buy looking at CPU-Z screenshots?

MrShare

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Jun 12, 2015
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I have a 4GB DDR3 RAM on my laptop. Want to add another 4GB. heard that it should have the same frequency as that of old RAM for best performance. So which frequency RAM should I buy? One screenshot shows 798 Mhz. But some says its actually 2x798 = 1600 approx and I should buy 1600 Mhz RAM. Can anyone clarify please.

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