wait until its possible to flash android on the NAND...if thats not possible, i'm pretty sure, you can never use the "full" ram...
but why should someone use it? i think its never full on android, even when you havent got the full ram enabled.
I'm only a little German. Sorry for the bad english :P
Phone ROM: IceColdSandwich + BlackICS; SD Slots: Changing
HTC Desire HD
Recovery: 4EXT Recovery Touch +Control, always latest
Nexus 7 (16 GB), rooted, CWM - Stock 4.2