the question is why? what is the problem you are trying to solve?
I have 4 GB RAM installed, I am running Win7 x64 Home Prem. My Task Mgr/Resource Monitor shows 4 GB installed with 1027 Mb of RAM (1 GB+) held as reserved. Now I'm wondering if it isn't just the limitations of my MOBO's BIOs in this DELL DIM E520 after reading all the responses.