1066mhz ram running at 667mhz?

In theory u have a perfect combo Ram-Chipset Mobo.
By the other hand u have to understand that all DDR2 1066MHz Ram are overclocked 667MHz or 800MHz based Memory. Are nothing but selected, in factory, good chips that can overclock better than other.
Use CPU-Z to read Memory section. U will see the actual speed and timings that the memory use now,and under section SPD u will read the JEDEC instructions and EPP instructions.
Under JEDEC voice u will find "standard" DDR2 timings and frequency, under EPP u will find the instructions for overclocked settings like 1066MHz frequency and timings tested for that freq, in this case i think they are 5-5-5-9   . And the voltage is very important. Standard voltage ,under JEDEC compliance is, for most DDR2 memory, 1.8v. Usually for EPP capable or"ready" memory the voltage is 2.1v-2.3v under EPP instructions.
As i first mantioned u have a good combo, in theory.
EPP (Enhanced Performance Profiles) stands for an open standard developed by Nvidia and adopted by most mainstream memory makers used to write additional information to the spd chip of each memory module. This information contains the parameters to set the memory timings to on select motherboards that support this feature. While memory modules with Enhanced Performance Profiles will work on any motherboard, only motherboards equipped with properly-designed BIOS's, such as those designed for NVIDIA nForce® 590 and 680 SLI media and communications processors (MCPs), will detect the presence of these new capabilities and prompt the user to set PC boot parameters for guaranteed optimized settings. When paired with NVIDIA nForce 680i SLI or 590 SLI-based motherboards, SLI-Ready memory exposes advanced performance memory settings.

I guess u have to access the BIOS settings to sett the Memory voltage manually and check if the EPP instruction are sett. if not u will have to sett manually.
Search for more infos on the Internet, and good luck!  

Best answer selected by hooda88.