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Asus Maximus Extreme and 2 kits of CMX4GX3M2A1600C9


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Hi Guys,


I have Asus Maximus Extreme and i bought recently 2x Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A1600C9) [CMX4GX3M2A1600C9], which is in total 8 GB, each slot 2gb. My questions is, how can make my rams run at 1600Mhz since i dont know the right settings to put in the bios. The default is 1333 Mhz and runs perfectly. When i change the settings, the computer doesnt boot.


Can someone provide me the correct overclocking settings for my motherboard in order to run these rams?


Thank you

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there is no way of affirming they are the same. you cannot go by part#. could be from different batches or BOM.

im not saying it wont work, im saying if the 2 kits combined will not operate at 1600 there is no recourse on your part or Corsairs. it is an unsupported configuration plain and simple.

please read the documents in my sig it will explain everything.


for ram to be officially supported all sticks must come from 1 package only.

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Ok i do understand now.


My pc consist of this parts:



Memory:CMX4GX3M2A1600C9 x 4 modules total 8 GB

Motherboard: Asus Maximus Extreme(Version of Bios 1302,latest)

PSU:Thermaltake 1000w


Can you please fill the empty blanks for me how to put the settings in the Bios to run my DDR3 rams at 1600Mhz


BIOS Settings:


Extreme Tweaker:

Ai Overclock Tuner: Manual

OC From Level Up:

CPU Ratio:

FSB Freq:

FSB Strap to NB:

PCIE Freq:


DRAM Freq:

DRAM Command Rate:

DRAM Timing Control:

Primary Info:


RAS to CAS Delay:

RAS Precharge:

RAS Active Time:

RAS to RAS Delay:

Row Refresh Cycle:

Write Recovery Time:

Read to Precharge:

Secondary Info:

Read to Write Delay(S/D):

Write to Read Delay(S):

Write to Read Delay(D):

Read to Read Delay(S):

Read to Read Delay(D):

Write to Write Delay(S):

Write to Write Delay(D):

DRAM Static Read Control:

DRAM Dynamic Write Control:

Ai Clock Twister:

Ai Clock Skew A:

Ai Clock Skew B:

Ai Transaction Booster:




CPU Voltage:

CPU PLL Voltage:

DRAM Voltage:

FSB Termination Voltage:

North Bridge Voltage:



NorthBridge Chipset Config:


Memory Remap Feature: Enabled

Init. Graphic Adapter: PEG/PCI

PEG Port Control: Auto

PEG Port force x1: Disabled

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  • 2 weeks later...
i dont think i can exchange.Its better i leave it at 1333Mhz since the Motherboard more than 4 years old.I might think of upgrading to socket 2011 with Quadchannel memory.

You may try to overclock you system in "Manual" mode and set parameters for RAM:

DRAM Freq: 1600

DRAM Command Rate: 2T

DRAM Timing Control: Manual

Primary Info: 9-9-9-24

CAS#: 9

RAS to CAS Delay: 9

RAS Precharge: 9

RAS Active Time: 24

RAS to RAS Delay: 9

Row Refresh Cycle: from 82 to 110 (try to start from 110!)

Write Recovery Time: 24

Read to Precharge: 9

Also set to "400" FSB and "FSB Strap to NB"

Actualy you need to set only this parameters and all other to "AUTO".

Try it and let me know about results.

Good luck!

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  • 3 weeks later...
Dear iRX,sorry for the late response.i did use your settings,however i kept auto for write recovery time since it has until 15 instead 24 .it works fine now,it booted properly.i will inform if something goes wrong.thank you for your help:)
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  • 2 weeks later...

Is there by any chance that these RAMs that i bought might not be fully compatible with my motherboard in any setting i put?Cause i checked my motherboard's memory compatible list and they are not included. I do understand that my M/B is 4 years old but there has to be a setting in the Overclock menu that will run stable.


Please advice


Front Side Bus 1600/1333/1066/800 MHz

Memory 4 x DIMM, Max. 8 GB, DDR3 1800*/1600*/1333/1066 ECC,Non-ECC,Un-buffered Memory

Dual Channel memory architecture

Support Intel® XMP Technology

*Overclock speed

**When installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.

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can you isolate the 2 pairs reset the bios to defaults and enable XMP with just 1 pair first, then reset the bios again with the other pair and enable XMP and see if it runs.

this way you at lease see if 1 pair will be ok, then you can try adding 1 stick at a time between reboots.


good luck!

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Yes i loaded with default settings and still it was unstable.im currently using my previous 3 rams on 3 slots and on the 4th slot i have installed 1 corsair ram and my pc is running stable on 1333 mhz almost a week.dont know why but its ok like this
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