Thanks for the input, Vario, I see you are running Sandy and Ivy systems, so you know what they can do with memory. I bought 2400 sticks because it was only $15 more at the time, and what surprised me was the lower latency, considering the looser timings required. In the AIDA64 memory bencmark, I always have the lowest latency of all compared systems, and CPU scores that beat everything but 6 core Intel chips. Yes, it's only a benchmark, but I believe I can feel the difference in responsiveness compared to 1600 sticks (unless it's the "placebo effect"). I usually shop for RAM on NewEgg, and there is no cheap RAM anymore, but I noticed that 1600 is just as high as 2400, even in the same brand sometimes. So my thinking is that you might as well get the 2400, as long as your IMC and motherboard can handle it. It's only a one-time purchase, and it doesn't wear out (or if it does you have a lifetime warranty). In the future more programs and games will be optimized to take advantage of faster RAM.