There are many different things that could cause this issue. Please try all of the following solutions. In none of these help feel free to contact EVGA's Technical Support Team. 888-881-EVGA (3842)

SOLUTION: Verify that you memory setting are set correctly in the BIOS.
This is the most common problem. the settings can be adjusted in the bios under memory feature, which is found under frequency / voltage control. you will also need to adjust the voltage for the memory that is found under frequency / voltage control -> voltage control.

SOLUTION: Verify that the Memory Low Gap setting is at AUTO.
The Memory Lo Gap is designed to remap the memory addresses so that all of the memory will be usable with a supported operating system. This feature could be found in the bios (Del during bootup), in Memory Feature which is found in Frequency/Voltage Control. It is recommended that you verify that this setting is still set to AUTO.

SOLUTION: Verify that the "MCH Strap" setting is changed to "DRAM Ratio".
You will need to verify that you have the latest bios for this solution. This option was added to the bios in version 73. The option is found under frequency / voltage control.

SOLUTION: Adjust the "TRL" setting under "memory feature" to +2.
You will need to verify that you have the latest bios for this solution. This option was added to the bios in version 73. The option is found under memory feature which is in the frequency / voltage control.

SOLUTION: Verify that your operating system is not limiting the amount of memory that you can detect. NOTE: 32bit OS's are limited to 4gb or less.
with all Microsoft operating systems that are 32 bit the operating system will not be able to use memory greater than 4gb. With 64bit operating systems there are some versions of newer operating systems that are limited by the operating system version.

SOLUTION: Verify that the memory sticks and memory slot are working correctly.
First, test EACH module of memory one at a time in memory slot 1, which is the colored slot closest to the CPU. If you install a memory module and the system does not post, OR gives you a post code of F3, F6, C1, C3, 68, or 69, that would indicate that the memory that you are testing is not working correctly. After testing ALL you memory modules, you can test a known good module of memory in each of the primary memory slots, 1, 3, and 5. If it boots up and does not give you the above post codes in those slots, use a good module of ram in slot 1 plus use a second know good module in slot 2, then 4, then 6.

SOLUTION: Verify that there are not damaged or bent CPU pins.
Since the socket 1366 processors have the memory controller as part of the CPU, any bent CPU pin that makes contact with other pind, or does not contact the CPU correctly could be the cause of the memory detection error. If there are bent CPU pins EVGA offers a repair service for products that are still in warranty.

If you have tried all these solutions and are still experiencing problems, feel free to contact EVGA Technical Support at 888-881-EVGA (3842).