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Secondary SPD XMP Timings differ from motherboard defaults


ixion

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Hello,

 

My setup:

Motherboard: Asus Maximus Extreme IV, BIOS 2302

CPU: Core i7 2600k

RAM: Corsair CML16GX3M4A1600C9 (4 x 4GB @1600MHz, using XMP Profile#1)

 

 

When looking at the SPD XMP profile #1, I noticed that the secondary timing values are different than what my motherboard defaults to. Specifically, the following values are different:

 

Motherboard defaults (when left at Auto with XMP Profile 1 selected):

tWR = 10

tCWL = 7

 

SPD XMP values (from the RAM SPD):

tWR = 12

tCWL = 9

 

 

These are Write Recovery and CAS Write Latency. Seems to me that these are pretty important values.

 

So my question is this: should I manually change the BIOS timings to match the SPD? Or is my motherboard correctly setting these values based on the primary timings (9-9-9-24-2T)?

 

Thanks,

ixion

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Or is my motherboard correctly setting these values based on the primary timings (9-9-9-24-2T)?

Your MB is setting those values . As long as you have set the first four values , and the frequencies , or just enabled the XMP profile, you leave the rest on auto. They are more MB related and will adjust accordingly as needed.

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Thanks for the reply.

 

But, I have since read that it is advised to set tCWL at a value of CAS minus one. (tCWL = CAS - 1).

 

If so, then my motherboard is setting default at CAS minus two (CAS=9 and tCWL=7).

 

Should I worry about this?

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