This is not part of the grant and depends on the Nu source code.
2.1.1 (once it’s complete) will require much less RAM than 2.0.3.
For 2.0.3 I say, the hardware requirement is 1 GB RAM.
2.1.1 should do with 512 MB RAM.
The RAM requirements are based on my experience so far.
It might differ, if you have a lot if NSR in your wallet, which require additional RAM (at least when minting). This is what e.g. @mhps wrote and it makes sense.