Could the timing of this be something to do with Rambus/RDRAM patents expiring? RDRAM made it to market in the late 90s, so relevant patents could conceivably b

Could the timing of this be something to do with Rambus/RDRAM patents expiring? RDRAM made it to market in the late 90s, so relevant patents could conceivably be from ~1995-1996, and would be expiring around now. I seem to remember QDR being mentioned in the context of RDRAM back in the day (although the stuff that shipped only ever used DDR tech). Or have all the major players already licensed those patents years ago and squeezed out the tech? Or is that 20-year-old tech pretty much obsolete in today's context anyway?