The memory was an addition to the already built, identical modules. The compatibility was thus given (ASUS P8 Z68-V Pro). The memory works very well, is very stable. Here are a few Benchmardaten (AIDA64), but which may, depending on the current, installed software, used only for the board with a Core i7-2600K under Win7, as approximate values! Write Speed 24490 MB / s Reading Speed 22553 MB / s Copy Speed 23587 MB / s Delay 56.8 ns