1.6g isn't enough to boot ontap anymore, however with a little tweaking you can pare it down to just 2gb/node.
First shut it down and set the ram to 2gb. then boot to the loader and enter the following:
setenv bootarg.init.low_mem 512
setenv bootarg.vnvram.size 64
setenv nvram_discard true
autoboot
Its stable enough for a lightweight laptop demo, but probably won't hold up if you prush it.