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I checked my RAM speeds in CPU-Z and noticed that they were lower than they should be. I've looked at related threads (e.g. this and this) but they didn't have the same problem as me.

Both my RAM sticks are DDR3 and supposed to run at 1600 MHz. Becuse CPU-Z reports actual RAM speeds, I'm expecting to see 800 MHz on both.

The problem is that on the JEDEC #3, 4, 5, 6 fields, it's reporting frequencies significantly lower than 800 MHz.

As expected, JEDEC #5, 6 on slot 1 and JEDEC #6 on slot 2 report 800 MHz. I know that the speeds can sometimes be lower, so that 700-ish speeds didn't surprise me. What surprised me though are the 609, 640, and 685 MHz readings. Those three readings suggest that those 'JEDEC's (no clue what that means) are running at or even slower than 1366 MHz.

Does anyone know what could cause this? Is it a cause for concern?

Here are screenshots of both sticks:

Slot #1:

enter image description here

Slot #2:

enter image description here

harrymc
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jdabtieu
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1 Answers1

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Your RAM comes with several JEDEC profiles, some of which are shown by CPU-Z. These are the profiles that your RAM is capable of running at.

The motherboard will choose among these JEDEC profiles the one that it prefers using, in view of the motherboard's capabilities and the JEDEC profiles of all the other RAM sticks.

Which JEDEC profile was chosen, can be derived from the Memory tab of CPU-Z.

harrymc
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