How DRAM Frequency works

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LiptonBlast

Commendable
Mar 29, 2016
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I have 1 4GB Corsair Vengeance 1600mhz ram stick but when I use monitoring programs like CPU-Z it shows my DRAM Frequency is 686.6 MHz. Can someone please explain how exactly this works? Also in CPU-Z it shows SPD Ext. is XMP 1.3. What does this mean? Hope someone can clear things up for me :D
 
Solution
Tradesman1
It's DDR the true frequency the DRAM runs at is around 667 so, since it is DDR (DOUBLE data rate) you take freq x 2 to get effective data rate of 1333
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