Is DIMM to USB convertor available?
Solution 1:
I have never heard of a USB RamDisk. I know you can get SATA ones:
http://techreport.com/articles.x/16255
so I guess there's no reason why you couldn't get a SATA one and put it in an external USB housing.
Not cheap though and most I have seen use DIMM not SODIMM.
Solution 2:
Interesting idea, however the short answer No. There is more needed then just a simple converter for RAM to actually remember the data that is stored on it. Flash media != Memory.