Maximum resolution of an imported 32bit EXR in 16 or 32bit color mode restricted?

Hi, does the maximum resolution of an 32bit EXR  comped and rendered in 16bit or 32bit color mode depend on the installed RAM? I have 64GB RAM (16 GB reserved for other apps) and get an error (“Image buffers of size [width]x[height] @ [depth] bpc ([n] GB) exceed internal limits...”) when trying to render a comp at 11811x11811 pix. I could only use 8 bit mode for this comp and get a lot of color bending... So to avoid this issue I switched to half res and rendered everything in lower resolution.

My system variables of virtual memory are set to 'use automatic...'

I have multiple layers in the comp. So I am guessing I am over 2GB per frame.

Can installing 128GB of RAM or even more solve something on this issue? 

I don't have 2 GB RAM per core (I have 2x10 cores with HT = 40 Cores). Is this problematic in any way?