From the Memory Express website for your Mushkin XP3-10666 Blackline
Memory Type \tPC3-10666 DDR3 SDRAM
Using the image above as a reference point, set your Memclock Value to 1333mhz, DRAM timing to Auto for now (if you still have trouble go into manual mode and set them to 7-7-7-20 as they should follow in that order), and the Memory Overvoltage to 1.7v to start. Try running Memtest after that.
Chances are, your memory voltage at stock is too low for the Mushkin you put in there (I believe DDR3 defaults around 1.5v) which would definitely cause memory errors and crashes. If you still get errors, take it back to memoryexpress and let them know, they should give you a replacement set of ram no problems.