Exactly, there is a big difference between real RAM and virtual RAM.

I can't think of many situations where you would be using that much virtual ram and not have significant performance issues due to the system constantly swapping data back and forth (remember 'disk thrashing' on older windows boxes when they started to run out of ram?) Also storage on an SD card will be much, much slower than that on the internal swap area.

Due to the prevalence of native code, here should be less need for virtual ram than on other systems - and application binary and shared libraries etc. are often 'loaded' by mapping them into memory as though they were part of a virtual memory pagefile, under normal circumstances no binary executable code would hit your main virtual memory file.