I actually asked a forensics expert about this. He said that CBA doesn't work against DDR3 unless the memory is frozen. Unlike DDR2 etc DDR3 has its state decay very rapidly, so you cannot quickly restart the machine and boot up into a forensics live OS, or remove the RAM and put it into a forensics laptop. But the rate of its state decay is still slowed by freezing it, so provided you freeze it the attack is still feasible. CBA doesn't always inherently involve freezing the RAM, but in cases where the RAM is frozen it is still applicable to DDR3.