Ternary Computing

On second thought, maybe if you can implement TCAM with DRAM, you could get the X state by charging the capacitor a little less (shorter / via a higher resistance path). Then design the comparator such that it accepts both 0 and 1 if the other input is in this "middle band". If the refresh cycle is fast enough that a 1 won't decay into an X (or an X into a 0), then maybe this could work.

But I'm sure people much smarter than me have tried to optimize TCAM for many years, and are already using ideas much better than I can think of, so I'll stop now.