Well how much ram does your pc have? Take whatever ram you have and deduct about 2gb from that (for windows and the other odd small thing that may be running) You could even try 1.5 gb instead of 2, but 2 safer.
So if you have 16gb, set your dynamic ram to 14gb
The scene doesnt seem that heavy, but you can try switching off max frame buffer, enabling vray frame buffer and set it to “preview mode” only. This leaves more free ram so you have more during rendering
Set VFB to save out to and EXR or VRIMG file.
Let us know how you get on