Hello I would like to know if there any device which could preserve content of RAM once removed from a host system and this special device could be connected perhaps by way of USB to another machine for forensic analysis ? The reason for the special device is because I believe that the memory controller may have technologies which could prevent a complete memory dump via say Windows for the entire memory space. The memory address space may be altered preventing an entire or complete memory capture, dump. Some sort of device that law enforcement may use.
Yes. Viking, for one example, has DIMMs with built-in Flash, and a super-capacitor to power the RAM/flash for long enough to copy the RAM to Flash in case of power outage.
At least at one time, there were also DIMMs with built-in battery back up, but these seem to be less popular than the RAM/Flash version, at least for the moment.