Summary: This is the first time I ever decided to write a review. I will state facts only. My initial order of this memory arrived in two days, well packaged and in a Kingston factory sealed box. Inside, I found four sets of empty heat sinks. Amazon's RMA process was painless, and the replacement memory arrived the next day. My CPU had not even been shipped yet (pre-ordered 4790K) so the memory sat.
Summary: Worked at 1333 MHz. I was unable to get them to perform at 2400MHz. I ended up sending them back. I am not sure if it was a memory, motherboard or lack of knowledge problem, but they didn't work for me