system wm5 and wm6.1 will take 128mb ram straight away.
If you want to try upgrade ram , i will post how to and tools & chip where
all from current ebay list.
ref. my screenshots. inside [DEV] iPAQ hw6900 Series WM6.5.x ROM project (screenshots)
Plus: Weller WST2 Pyropen Jr Cordless Butane Soldering Iron