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1066MHz Dominator running at 800MHz


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Hi all,


Hope somebody can help me out.


I have a Dell XPS 630i and have just brought 8gb (4x2gb) of corsair dominator RAM.. TWIN2X4096-8500C5DF.


I cannot get the stuff to run at 1066MHz, my specs are below.


Dell XPS 630i

8gb Corsair dominator

2 x nvidia 9800 gx2's running in quad sli

intel core 2 quad Q9650 @ 3.0GHz


Any ideas anyone???



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Originally Posted by RAM GUY

With 4 modules I would suggest setting the memory frequency at DDR800 or 667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.


what you have are 2 sets of matched ram, for a 4 stick config it must be purchased that way not 2+2. a 4 stick set has been matched and tested together.


in fact the only tested compatible ram for your rig from Corsair is DDR667


any other model you get to work at all is a gift. so if you are fully up and running at 800 you have beat the odds.

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I cannot get the system to run when tring to clock the memory at 1066MHz.


It will either run for a few seconds then hang or bsod.


I have put the timings to 5-5-5-15, changed the voltage to 2.1.


All works fine when ram runs at 800Mhz.


A soon as i change anything else it goes wrong.


Any ideas?



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  • Corsair Employees

What is the system configuration and how many modules are installed?

As I said before if you have more than 2 modules installed you will not be able to run them at DDR1066 DDR667 or DDR800 would be suggested.

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Thanks for the reply.


I have 4 x 2gb sticks installed so a total of 8gb running vista ultimate 64bit.


Looks like i can only run it at 800mhz then....which is fine by the way, i just wanted to check if it would be possible to run it at 1066.



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  • Corsair Employees
It will be hit and miss running 4 up at full speed but for sure you would need to play with the Voltage and timings just don't go over 2.1 Volts for the memory and don't go over +.3 over default Volts for for the Memory Controller Voltage
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