Possible problem with 9136C5D memory

[El_Robbo]

Hi, I have a question regarding some issues I have had with my memory. I have four sticks of Corsair TWIN2X2048-9136C5D memory, installed in an EVGA 680i motherboard. When I install any two of the sticks (2 gigs), in any two of the dimm slots, I can enable SLI-ready memory, and my memory runs at 1142 MHz. But, when I try to install all four sticks (4 gigs) and enable SLI-ready memory, my computer beeps on startup and restores safe settings, and my memory runs at 800 MHz. If disable SLI-enabled memory and I unlink the FSB and the memory bus, I can manually set the memory bus as high as 1000 MHz, and my computer will run at 1000 MHz. If I go above 1000 MHz (e.g. 1050 MHz), my computer will boot without any problems, but the nVidia monitoring tool indicates that the memory bus is still running at 1000 MHz. So, in other words, with 2 gigs of memory, I can run at 1142 with SLI-memory enabled, but with 4 gigs I top out at 1000 and have to disable SLI-memory. My voltage is at 2.1 V per Corsair's recommendations.

 

I spoke with EVGA customer service about this, and they didn't seem to know why this is happening. I then called Corsair, and they told me that I should expect a drop in maximum memory bus speed when using all 4 dimm slots b/c of decreased efficiency. They said that it would be unlikely for someone to get over 1000 MHz when using all 4 dimm slots. The tech guys at the store where I purchased my components confirmed that when they build systems, they notice a decrease in memory bus speed when they use all 4 dimm slots.

 

Does anyone have any thoughts on this issue? I am asking because someone in the EVGA forum mentioned that they have 4 gigs of Corsair dominator memory running at 1066 (I think it was the 8500C5D). Any ideas why I am topping out at 1000?

[RAM GUY]

First thing, this is nothing new and is normal because of loading on the memory controller as you add more memory modules you will have to slow the memory down. And the modules you have need 2.4 Volts please set the voltage to 2.4 Volts and then to be sure you can test the modules one set at a time with http://www.memtest.org.