Interesting idea to reuse old memory as a Ramdrive.
However who remembers ISA Ram expansion boards?
I myself had 2 in my ancient 386sx16 with Mathco. My system had a full 4megs of Dram in chips. Now I had yes 10 isa expansion cards in a standard 7 ISA expansion a mobo.
I had a 2meg dram expansion board in a 16bit slot and I had a later version of this board that could hold 4 30pin Simms of which I had 4megs. Giving me a total of 10megs of Ram!
I used 2 vertical 16bit Isa expansion boards often in Compaq systems at the time to have 10 ISA cards.