SLC vs eMLC
Looks like Hitachi are using SLC, hence the much better endurance numbers than the Intel 520. This will command a very high premium over the 520, even if headline performance is not as good. I imagine steady state performance will be better though. The big story for me is that if this is Intel fabbed NAND, this would mean Intel are producing 25nm SLC, so maybe there will be a true successor to the X25-E?