Sorry you had to learn the hard way. *An earlier visit to this corner of cyberspace would have let you know right away as this is common knowledge among those who do a lot of builds or are constantly upgrading. *The faster the memory gets the more finicky it becomes. The manufacturer bins the kits that work together, all of them do. Every now and then you might get lucky running them slow with loose timings but for the most part mix and match isn't a good idea even with the exact same part number. *I pretty much avoid New Egg like the plague these days unless it's something that you can only source from them just over their return policies. Last kit I bought from them wouldn't work at all, didn't find out until it was already shipped and then they give me the same run around amd restocking fee and insist I use their shipping method which is FedEx ground. They won't pick up from a residence and there is nowhere to drop. FedEx overnight is a completely different business and does not accept ground packages. I sent it to them priority mail on my dime and they sent it back slow boat without so much as an email. In the end by the time it got back to me the 30 days was up and I have a 32GB kit 4x8GB of 3200MHz corsair vengeance with red leds that I have no use for still sealed.*
