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DDR3 Memory stopped working at 1600MHz

Last response: in Motherboards
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February 25, 2011 5:32:27 AM

Hi,

I have I7 920 processor (D0 stepping, not overclocked)) and Asus Rampage 2 Gene motherboard plus Muskin 1600MHZ DDR (3x2GB) memory kit. This ran just well with Gainward 8800 GT Golden Sample 1GB display card. In addition I have Seasonic 750W PSU.

Yesterday I installed 9800 GTX display card. While installing I noticed that the card requires 2 x 6-pin PCI power cable (8800 GT survived with one :) ). So I installed two. Then I started system, but I got error that "Unable to load XMP memory profile, defaulting to 1066 MHz". (I need to load the memory XMP profile , that is setting from BIOS, so that I get 1600 MHZ speed). Any other than 1066 MHz speed is not working anymore. Is it possible that the display card made this "weird change" to my system?

Next I think I will try 275 GTX and 285 GTX display cards, but I am a bit afraid that I ran into the same problem...
February 27, 2011 3:28:43 AM

Did you add a second card or just replace your original card?
IF you are running 2 VC then you need a bigger PSU.
Why are you wasting your time with those old cards?
Go get a 460 instead...

Make sure you a getting the power from the right connector. I've heard a few people mistaking for the wrong one.
The XMP profile is an OC as Intel only spec 1066 for the memory. Check the voltages on the memory as most 1600Mhz require 1.6 or more
While stock Intel specs are 1.5.




dbsfin said:
Hi,

I have I7 920 processor (D0 stepping, not overclocked)) and Asus Rampage 2 Gene motherboard plus Muskin 1600MHZ DDR (3x2GB) memory kit. This ran just well with Gainward 8800 GT Golden Sample 1GB display card. In addition I have Seasonic 750W PSU.

Yesterday I installed 9800 GTX display card. While installing I noticed that the card requires 2 x 6-pin PCI power cable (8800 GT survived with one :) ). So I installed two. Then I started system, but I got error that "Unable to load XMP memory profile, defaulting to 1066 MHz". (I need to load the memory XMP profile , that is setting from BIOS, so that I get 1600 MHZ speed). Any other than 1066 MHz speed is not working anymore. Is it possible that the display card made this "weird change" to my system?

Next I think I will try 275 GTX and 285 GTX display cards, but I am a bit afraid that I ran into the same problem...

February 27, 2011 5:21:28 AM

No I replaced my old 8800GT. And are you saying that Seasonic 750W PSU cannot handle I7 and 2 video cards? I think it should be ablet o handle like I7 plus 2x275 GTX in SLI, of course I might be wrong...

Did not know that the XMP is only for 1066 memory, as in my bios when I select XMP then it automatically fetches 1600 MHz speed there. But anyways thanks, I had to set "overclock memory to next level" and then select 1600 MHz. Now it is putting more voltage on the memory, and they work at 1600 MHz.

I tested the following cards:

Gainward 8800 GT -> 9800 GTX
9800 GTX -> EVGA 275 GTX
EVGA 275 -> Galaxy 275 GTX
Galaxy 275 GTX -> Gainward 285 GTX

Conclusions:
EVGA 275 GTX probably the best out of those cards as it is almost as fast as Gainward 285 GTX but considerable less noisy :) 

And why I am wasting time with old cards? Well because I have them, if I had 460 I would try that too :D  But as I checked http://www.hwcompare.com/8143/geforce-gtx-285-1gb-vs-ge... I should get 460 as its power consumption is like 50 watts less than 285 gtx and it is superior in performance too.
February 27, 2011 8:21:36 PM

You misread what I typed.
Intel spec for their CPU's is 1066 memory ( that's what they recommend) Memory makers sell faster memory for higher prices & more profit.
Stock settings sets it at 1066.
By using the XMP profiles you are essentially over clocking you rig. Some times you have to manually bump up the voltages to the right settings.

I have no idea how good or bad a Seasonic PSU is as I have never heard of them.
Some are just relabeled from other makers.



dbsfin said:
No I replaced my old 8800GT. And are you saying that Seasonic 750W PSU cannot handle I7 and 2 video cards? I think it should be ablet o handle like I7 plus 2x275 GTX in SLI, of course I might be wrong...

Did not know that the XMP is only for 1066 memory, as in my bios when I select XMP then it automatically fetches 1600 MHz speed there. But anyways thanks, I had to set "overclock memory to next level" and then select 1600 MHz. Now it is putting more voltage on the memory, and they work at 1600 MHz.

I tested the following cards:

Gainward 8800 GT -> 9800 GTX
9800 GTX -> EVGA 275 GTX
EVGA 275 -> Galaxy 275 GTX
Galaxy 275 GTX -> Gainward 285 GTX

Conclusions:
EVGA 275 GTX probably the best out of those cards as it is almost as fast as Gainward 285 GTX but considerable less noisy :) 

And why I am wasting time with old cards? Well because I have them, if I had 460 I would try that too :D  But as I checked http://www.hwcompare.com/8143/geforce-gtx-285-1gb-vs-ge... I should get 460 as its power consumption is like 50 watts less than 285 gtx and it is superior in performance too.

You misred
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