Your RAM directly modifies the specific parts your program need modified. On the other hand, if your SSD did the same, these parts will wear out quicker than the others, so the SSD only says that it modifies the same address, but it actually has its own controller which makes things so a different cell is modified each time (in the ideal case) - that's called "wear-leveling". If Intel's gizmo is prone to such wear, it most probably will use some sort of wear-leveling too. This makes the whole device wear out almost evenly with the speed of memory change. You are right that working with the memory doesn't include only writes. There are a lot of reads too and the reads aren't causing wear. So, if reads:writes are 4:1, then you are looking at a month, instead of a week. This again is short of 'nearly forever'.